diff --git a/packages/app/src/index.tsx b/packages/app/src/index.tsx
index 7bce8257f..8435f23cf 100644
--- a/packages/app/src/index.tsx
+++ b/packages/app/src/index.tsx
@@ -2,14 +2,14 @@ import "./index.css";
 import "@szhsin/react-menu/dist/index.css";
 import "./fonts/inter.css";
 
-import {default as wasmInit} from "@snort/system-query";
+import { compress, expand_filter, flat_merge, get_diff, default as wasmInit } from "@snort/system-query";
 import WasmPath from "@snort/system-query/pkg/system_query_bg.wasm";
 
 import { StrictMode } from "react";
 import * as ReactDOM from "react-dom/client";
 import { Provider } from "react-redux";
 import { createBrowserRouter, RouterProvider } from "react-router-dom";
-import { EventPublisher, NostrSystem, ProfileLoaderService, Nip7Signer, PowWorker } from "@snort/system";
+import { EventPublisher, NostrSystem, ProfileLoaderService, Nip7Signer, PowWorker, QueryOptimizer, FlatReqFilter, ReqFilter } from "@snort/system";
 import { SnortContext } from "@snort/system-react";
 
 import * as serviceWorkerRegistration from "serviceWorkerRegistration";
@@ -39,6 +39,21 @@ import { db } from "Db";
 import { preload, RelayMetrics, UserCache, UserRelays } from "Cache";
 import { LoginStore } from "Login";
 
+const WasmQueryOptimizer = {
+  expandFilter: (f: ReqFilter) => {
+    return expand_filter(f) as Array<FlatReqFilter>;
+  },
+  getDiff: (prev: Array<ReqFilter>, next: Array<ReqFilter>) => {
+    return get_diff(prev, next) as Array<FlatReqFilter>;
+  },
+  flatMerge: (all: Array<FlatReqFilter>) => {
+    return flat_merge(all) as Array<ReqFilter>;
+  },
+  compress: (all: Array<ReqFilter>) => {
+    return compress(all) as Array<ReqFilter>;
+  }
+} as QueryOptimizer;
+
 /**
  * Singleton nostr system
  */
@@ -46,6 +61,7 @@ export const System = new NostrSystem({
   relayCache: UserRelays,
   profileCache: UserCache,
   relayMetrics: RelayMetrics,
+  queryOptimizer: WasmQueryOptimizer,
   authHandler: async (c, r) => {
     const { publicKey, privateKey } = LoginStore.snapshot();
     if (privateKey) {
diff --git a/packages/system-query/pkg/system_query.d.ts b/packages/system-query/pkg/system_query.d.ts
index 4b24908a0..4fdcb2a92 100644
--- a/packages/system-query/pkg/system_query.d.ts
+++ b/packages/system-query/pkg/system_query.d.ts
@@ -22,6 +22,11 @@ export function get_diff(prev: any, next: any): any;
 * @returns {any}
 */
 export function flat_merge(val: any): any;
+/**
+* @param {any} val
+* @returns {any}
+*/
+export function compress(val: any): any;
 
 export type InitInput = RequestInfo | URL | Response | BufferSource | WebAssembly.Module;
 
@@ -31,6 +36,7 @@ export interface InitOutput {
   readonly expand_filter: (a: number, b: number) => void;
   readonly get_diff: (a: number, b: number, c: number) => void;
   readonly flat_merge: (a: number, b: number) => void;
+  readonly compress: (a: number, b: number) => void;
   readonly __wbindgen_malloc: (a: number, b: number) => number;
   readonly __wbindgen_realloc: (a: number, b: number, c: number, d: number) => number;
   readonly __wbindgen_add_to_stack_pointer: (a: number) => number;
diff --git a/packages/system-query/pkg/system_query.js b/packages/system-query/pkg/system_query.js
index 9fb7deef2..57dd87cf8 100644
--- a/packages/system-query/pkg/system_query.js
+++ b/packages/system-query/pkg/system_query.js
@@ -270,6 +270,26 @@ export function flat_merge(val) {
     }
 }
 
+/**
+* @param {any} val
+* @returns {any}
+*/
+export function compress(val) {
+    try {
+        const retptr = wasm.__wbindgen_add_to_stack_pointer(-16);
+        wasm.compress(retptr, addHeapObject(val));
+        var r0 = getInt32Memory0()[retptr / 4 + 0];
+        var r1 = getInt32Memory0()[retptr / 4 + 1];
+        var r2 = getInt32Memory0()[retptr / 4 + 2];
+        if (r2) {
+            throw takeObject(r1);
+        }
+        return takeObject(r0);
+    } finally {
+        wasm.__wbindgen_add_to_stack_pointer(16);
+    }
+}
+
 function handleError(f, args) {
     try {
         return f.apply(this, args);
diff --git a/packages/system-query/pkg/system_query_bg.wasm b/packages/system-query/pkg/system_query_bg.wasm
index 394d0f797..8590da75f 100644
Binary files a/packages/system-query/pkg/system_query_bg.wasm and b/packages/system-query/pkg/system_query_bg.wasm differ
diff --git a/packages/system-query/pkg/system_query_bg.wasm.d.ts b/packages/system-query/pkg/system_query_bg.wasm.d.ts
index 506a78650..3071e5fd3 100644
--- a/packages/system-query/pkg/system_query_bg.wasm.d.ts
+++ b/packages/system-query/pkg/system_query_bg.wasm.d.ts
@@ -5,6 +5,7 @@ export function diff_filters(a: number, b: number, c: number): void;
 export function expand_filter(a: number, b: number): void;
 export function get_diff(a: number, b: number, c: number): void;
 export function flat_merge(a: number, b: number): void;
+export function compress(a: number, b: number): void;
 export function __wbindgen_malloc(a: number, b: number): number;
 export function __wbindgen_realloc(a: number, b: number, c: number, d: number): number;
 export function __wbindgen_add_to_stack_pointer(a: number): number;
diff --git a/packages/system-query/src/lib.rs b/packages/system-query/src/lib.rs
index 0b1186088..c5766353f 100644
--- a/packages/system-query/src/lib.rs
+++ b/packages/system-query/src/lib.rs
@@ -44,6 +44,13 @@ pub fn flat_merge(val: JsValue) -> Result<JsValue, JsValue> {
     Ok(serde_wasm_bindgen::to_value(&result)?)
 }
 
+#[wasm_bindgen]
+pub fn compress(val: JsValue) -> Result<JsValue, JsValue> {
+    let val_parsed: Vec<ReqFilter> = serde_wasm_bindgen::from_value(val)?;
+    let result = merge::merge::<ReqFilter, ReqFilter>(val_parsed.iter().collect());
+    Ok(serde_wasm_bindgen::to_value(&result)?)
+}
+
 #[cfg(test)]
 mod tests {
     use super::*;
diff --git a/packages/system/src/gossip-model.ts b/packages/system/src/gossip-model.ts
index d931d6b66..2f2d9be82 100644
--- a/packages/system/src/gossip-model.ts
+++ b/packages/system/src/gossip-model.ts
@@ -1,7 +1,7 @@
 import { ReqFilter, UsersRelays } from ".";
 import { dedupe, unwrap } from "@snort/shared";
 import debug from "debug";
-import { FlatReqFilter } from "request-expander";
+import { FlatReqFilter } from "./query-optimizer";
 
 const PickNRelays = 2;
 
diff --git a/packages/system/src/index.ts b/packages/system/src/index.ts
index dd1f1f1dc..9bc4dd067 100644
--- a/packages/system/src/index.ts
+++ b/packages/system/src/index.ts
@@ -1,9 +1,11 @@
 import { AuthHandler, RelaySettings, ConnectionStateSnapshot } from "./connection";
 import { RequestBuilder } from "./request-builder";
-import { NoteStore, NoteStoreHook, NoteStoreSnapshotData } from "./note-collection";
+import { NoteStore, NoteStoreSnapshotData } from "./note-collection";
 import { Query } from "./query";
 import { NostrEvent, ReqFilter, TaggedNostrEvent } from "./nostr";
 import { ProfileLoaderService } from "./profile-cache";
+import { RelayCache } from "./gossip-model";
+import { QueryOptimizer } from "./query-optimizer";
 
 export * from "./nostr-system";
 export { default as EventKind } from "./event-kind";
@@ -24,6 +26,7 @@ export * from "./signer";
 export * from "./text";
 export * from "./pow";
 export * from "./pow-util";
+export * from "./query-optimizer";
 
 export * from "./impl/nip4";
 export * from "./impl/nip44";
@@ -96,6 +99,16 @@ export interface SystemInterface {
    * Profile cache/loader
    */
   get ProfileLoader(): ProfileLoaderService;
+
+  /**
+   * Relay cache for "Gossip" model
+   */
+  get RelayCache(): RelayCache;
+
+  /**
+   * Query optimizer
+   */
+  get QueryOptimizer(): QueryOptimizer;
 }
 
 export interface SystemSnapshot {
@@ -121,4 +134,4 @@ export interface MessageEncryptor {
   getSharedSecret(privateKey: string, publicKey: string): Promise<Uint8Array> | Uint8Array;
   encryptData(plaintext: string, sharedSecet: Uint8Array): Promise<MessageEncryptorPayload> | MessageEncryptorPayload;
   decryptData(payload: MessageEncryptorPayload, sharedSecet: Uint8Array): Promise<string> | string;
-}
+}
\ No newline at end of file
diff --git a/packages/system/src/nostr-system.ts b/packages/system/src/nostr-system.ts
index ec22de6c6..b7105016d 100644
--- a/packages/system/src/nostr-system.ts
+++ b/packages/system/src/nostr-system.ts
@@ -20,6 +20,8 @@ import {
   UsersRelays,
 } from ".";
 import { EventsCache } from "./cache/events";
+import { RelayCache } from "./gossip-model";
+import { QueryOptimizer, DefaultQueryOptimizer } from "./query-optimizer";
 
 /**
  * Manages nostr content retrieval system
@@ -72,12 +74,18 @@ export class NostrSystem extends ExternalStore<SystemSnapshot> implements System
    */
   #eventsCache: FeedCache<NostrEvent>;
 
+  /**
+   * Query optimizer instance
+   */
+  #queryOptimizer: QueryOptimizer;
+
   constructor(props: {
     authHandler?: AuthHandler;
     relayCache?: FeedCache<UsersRelays>;
     profileCache?: FeedCache<MetadataCache>;
     relayMetrics?: FeedCache<RelayMetrics>;
     eventsCache?: FeedCache<NostrEvent>;
+    queryOptimizer?: QueryOptimizer;
   }) {
     super();
     this.#handleAuth = props.authHandler;
@@ -85,6 +93,7 @@ export class NostrSystem extends ExternalStore<SystemSnapshot> implements System
     this.#profileCache = props.profileCache ?? new UserProfileCache();
     this.#relayMetricsCache = props.relayMetrics ?? new RelayMetricCache();
     this.#eventsCache = props.eventsCache ?? new EventsCache();
+    this.#queryOptimizer = props.queryOptimizer ?? DefaultQueryOptimizer; 
 
     this.#profileLoader = new ProfileLoaderService(this, this.#profileCache);
     this.#relayMetrics = new RelayMetricHandler(this.#relayMetricsCache);
@@ -92,9 +101,6 @@ export class NostrSystem extends ExternalStore<SystemSnapshot> implements System
   }
   HandleAuth?: AuthHandler | undefined;
 
-  /**
-   * Profile loader service allows you to request profiles
-   */
   get ProfileLoader() {
     return this.#profileLoader;
   }
@@ -103,6 +109,14 @@ export class NostrSystem extends ExternalStore<SystemSnapshot> implements System
     return [...this.#sockets.values()].map(a => a.snapshot());
   }
 
+  get RelayCache(): RelayCache {
+    return this.#relayCache;
+  }
+
+  get QueryOptimizer(): QueryOptimizer {
+    return this.#queryOptimizer;
+  }
+
   /**
    * Setup caches
    */
@@ -241,8 +255,8 @@ export class NostrSystem extends ExternalStore<SystemSnapshot> implements System
         return existing;
       }
       const filters = !req.options?.skipDiff
-        ? req.buildDiff(this.#relayCache, existing.filters)
-        : req.build(this.#relayCache);
+        ? req.buildDiff(this, existing.filters)
+        : req.build(this);
       if (filters.length === 0 && !!req.options?.skipDiff) {
         return existing;
       } else {
@@ -255,7 +269,7 @@ export class NostrSystem extends ExternalStore<SystemSnapshot> implements System
     } else {
       const store = new type();
 
-      const filters = req.build(this.#relayCache);
+      const filters = req.build(this);
       const q = new Query(req.id, req.instance, store, req.options?.leaveOpen);
       if (filters.some(a => a.filters.some(b => b.ids))) {
         const expectIds = new Set(filters.flatMap(a => a.filters).flatMap(a => a.ids ?? []));
@@ -397,4 +411,4 @@ export class NostrSystem extends ExternalStore<SystemSnapshot> implements System
     }
     setTimeout(() => this.#cleanup(), 1_000);
   }
-}
+}
\ No newline at end of file
diff --git a/packages/system/src/query-optimizer/index.ts b/packages/system/src/query-optimizer/index.ts
new file mode 100644
index 000000000..eb5a166d3
--- /dev/null
+++ b/packages/system/src/query-optimizer/index.ts
@@ -0,0 +1,43 @@
+import { ReqFilter } from "../nostr"
+import { expandFilter } from "./request-expander"
+import { flatMerge, mergeSimilar } from "./request-merger"
+import { diffFilters } from "./request-splitter"
+
+export interface FlatReqFilter {
+  keys: number;
+  ids?: string;
+  authors?: string;
+  kinds?: number;
+  "#e"?: string;
+  "#p"?: string;
+  "#t"?: string;
+  "#d"?: string;
+  "#r"?: string;
+  search?: string;
+  since?: number;
+  until?: number;
+  limit?: number;
+}
+
+export interface QueryOptimizer {
+    expandFilter(f: ReqFilter): Array<FlatReqFilter>
+    getDiff(prev: Array<ReqFilter>, next: Array<ReqFilter>): Array<FlatReqFilter>
+    flatMerge(all: Array<FlatReqFilter>): Array<ReqFilter>
+    compress(all: Array<ReqFilter>): Array<ReqFilter>
+}
+
+export const DefaultQueryOptimizer = {
+    expandFilter: (f: ReqFilter) => {
+      return expandFilter(f);
+    },
+    getDiff: (prev: Array<ReqFilter>, next: Array<ReqFilter>) => {
+      const diff = diffFilters(prev.flatMap(a => expandFilter(a)), next.flatMap(a => expandFilter(a)));
+      return diff.added;
+    },
+    flatMerge: (all: Array<FlatReqFilter>) => {
+      return flatMerge(all);
+    },
+    compress: (all: Array<ReqFilter>) => {
+      return mergeSimilar(all);
+    }
+  } as QueryOptimizer;
\ No newline at end of file
diff --git a/packages/system/src/request-expander.ts b/packages/system/src/query-optimizer/request-expander.ts
similarity index 64%
rename from packages/system/src/request-expander.ts
rename to packages/system/src/query-optimizer/request-expander.ts
index 2efa1d2c0..3dfdb5ef7 100644
--- a/packages/system/src/request-expander.ts
+++ b/packages/system/src/query-optimizer/request-expander.ts
@@ -1,27 +1,11 @@
-import { ReqFilter } from "./nostr";
-import {expand_filter} from "@snort/system-query";
-
-export interface FlatReqFilter {
-  keys: number;
-  ids?: string;
-  authors?: string;
-  kinds?: number;
-  "#e"?: string;
-  "#p"?: string;
-  "#t"?: string;
-  "#d"?: string;
-  "#r"?: string;
-  search?: string;
-  since?: number;
-  until?: number;
-  limit?: number;
-}
+import { FlatReqFilter } from ".";
+import { ReqFilter } from "../nostr";
 
 /**
  * Expand a filter into its most fine grained form
  */
 export function expandFilter(f: ReqFilter): Array<FlatReqFilter> {
-  /*const ret: Array<FlatReqFilter> = [];
+  const ret: Array<FlatReqFilter> = [];
   const src = Object.entries(f);
   const keys = src.filter(([, v]) => Array.isArray(v)).map(a => a[0]);
   const props = src.filter(([, v]) => !Array.isArray(v));
@@ -47,8 +31,5 @@ export function expandFilter(f: ReqFilter): Array<FlatReqFilter> {
     ...Object.fromEntries(props),
   });
 
-  return ret;*/
-
-  const ret = expand_filter(f);
-  return ret as Array<FlatReqFilter>;
+  return ret;
 }
diff --git a/packages/system/src/request-merger.ts b/packages/system/src/query-optimizer/request-merger.ts
similarity index 97%
rename from packages/system/src/request-merger.ts
rename to packages/system/src/query-optimizer/request-merger.ts
index 7b2f5cac1..5ed3900e1 100644
--- a/packages/system/src/request-merger.ts
+++ b/packages/system/src/query-optimizer/request-merger.ts
@@ -1,6 +1,6 @@
 import { distance } from "@snort/shared";
-import { ReqFilter } from ".";
-import { FlatReqFilter } from "./request-expander";
+import { ReqFilter } from "..";
+import { FlatReqFilter } from ".";
 
 /**
  * Keys which can change the entire meaning of the filter outside the array types
diff --git a/packages/system/src/request-splitter.ts b/packages/system/src/query-optimizer/request-splitter.ts
similarity index 67%
rename from packages/system/src/request-splitter.ts
rename to packages/system/src/query-optimizer/request-splitter.ts
index 931458d42..97f9b6284 100644
--- a/packages/system/src/request-splitter.ts
+++ b/packages/system/src/query-optimizer/request-splitter.ts
@@ -1,9 +1,8 @@
-import { flatFilterEq } from "./utils";
-import { FlatReqFilter } from "./request-expander";
-import { diff_filters } from "@snort/system-query";
+import { flatFilterEq } from "../utils";
+import { FlatReqFilter } from ".";
 
 export function diffFilters(prev: Array<FlatReqFilter>, next: Array<FlatReqFilter>, calcRemoved?: boolean) {
-  /*const added = [];
+  const added = [];
   const removed = [];
 
   for (const n of next) {
@@ -29,12 +28,5 @@ export function diffFilters(prev: Array<FlatReqFilter>, next: Array<FlatReqFilte
     added: changed ? added : [],
     removed: changed ? removed : [],
     changed,
-  };*/
-
-  const added = diff_filters(prev, next);
-  return {
-    changed: added.length > 0,
-    added: (added as Array<FlatReqFilter>),
-    removed: []
-  }
+  };
 }
\ No newline at end of file
diff --git a/packages/system/src/request-builder.ts b/packages/system/src/request-builder.ts
index 9a7c49aad..dcd0ba668 100644
--- a/packages/system/src/request-builder.ts
+++ b/packages/system/src/request-builder.ts
@@ -1,12 +1,11 @@
 import debug from "debug";
 import { v4 as uuid } from "uuid";
 import { appendDedupe, sanitizeRelayUrl, unixNowMs } from "@snort/shared";
-import { flat_merge, get_diff }from "@snort/system-query";
 
-import { ReqFilter, u256, HexKey, EventKind } from ".";
+import EventKind from "./event-kind";
+import { SystemInterface } from "index";
+import { ReqFilter, u256, HexKey } from "./nostr";
 import { RelayCache, splitByWriteRelays, splitFlatByWriteRelays } from "./gossip-model";
-import { flatMerge, mergeSimilar } from "./request-merger";
-import { FlatReqFilter } from "./request-expander";
 
 /**
  * Which strategy is used when building REQ filters
@@ -95,27 +94,25 @@ export class RequestBuilder {
     return this.#builders.map(f => f.filter);
   }
 
-  build(relays: RelayCache): Array<BuiltRawReqFilter> {
-    const expanded = this.#builders.flatMap(a => a.build(relays, this.id));
-    return this.#groupByRelay(expanded);
+  build(system: SystemInterface): Array<BuiltRawReqFilter> {
+    const expanded = this.#builders.flatMap(a => a.build(system.RelayCache, this.id));
+    return this.#groupByRelay(system, expanded);
   }
 
   /**
    * Detects a change in request from a previous set of filters
    */
-  buildDiff(relays: RelayCache, prev: Array<ReqFilter>): Array<BuiltRawReqFilter> {
+  buildDiff(system: SystemInterface, prev: Array<ReqFilter>): Array<BuiltRawReqFilter> {
     const start = unixNowMs();
 
-    //const next = this.#builders.flatMap(f => expandFilter(f.filter));
-    //const diff = diffFilters(prev, next);
-    const diff = get_diff(prev, this.buildRaw()) as Array<FlatReqFilter>;
+    const diff = system.QueryOptimizer.getDiff(prev, this.buildRaw());
     const ts = unixNowMs() - start;
     this.#log("buildDiff %s %d ms", this.id, ts);
     if (diff.length > 0) {
-      return splitFlatByWriteRelays(relays, diff).map(a => {
+      return splitFlatByWriteRelays(system.RelayCache, diff).map(a => {
         return {
           strategy: RequestStrategy.AuthorsRelays,
-          filters: flat_merge(a.filters) as Array<ReqFilter>,
+          filters: system.QueryOptimizer.flatMerge(a.filters),
           relay: a.relay,
         };
       });
@@ -130,7 +127,7 @@ export class RequestBuilder {
    * @param expanded
    * @returns
    */
-  #groupByRelay(expanded: Array<BuiltRawReqFilter>) {
+  #groupByRelay(system: SystemInterface, expanded: Array<BuiltRawReqFilter>) {
     const relayMerged = expanded.reduce((acc, v) => {
       const existing = acc.get(v.relay);
       if (existing) {
@@ -143,7 +140,7 @@ export class RequestBuilder {
 
     const filtersSquashed = [...relayMerged.values()].map(a => {
       return {
-        filters: mergeSimilar(a.flatMap(b => b.filters)),
+        filters: system.QueryOptimizer.compress(a.flatMap(b => b.filters)),
         relay: a[0].relay,
         strategy: a[0].strategy,
       } as BuiltRawReqFilter;
diff --git a/packages/system/src/system-worker.ts b/packages/system/src/system-worker.ts
index 622f03dd6..5871cc031 100644
--- a/packages/system/src/system-worker.ts
+++ b/packages/system/src/system-worker.ts
@@ -6,6 +6,8 @@ import { NostrEvent, TaggedNostrEvent } from "./nostr";
 import { NoteStore, NoteStoreSnapshotData } from "./note-collection";
 import { Query } from "./query";
 import { RequestBuilder } from "./request-builder";
+import { RelayCache } from "./gossip-model";
+import { QueryOptimizer } from "./query-optimizer";
 
 export class SystemWorker extends ExternalStore<SystemSnapshot> implements SystemInterface {
   #port: MessagePort;
@@ -29,6 +31,13 @@ export class SystemWorker extends ExternalStore<SystemSnapshot> implements Syste
     throw new Error("Method not implemented.");
   }
 
+  get RelayCache(): RelayCache {
+    throw new Error("Method not implemented.");
+  }
+  
+  get QueryOptimizer(): QueryOptimizer {
+    throw new Error("Method not implemented.");
+  }
   HandleAuth?: AuthHandler;
 
   get Sockets(): ConnectionStateSnapshot[] {
diff --git a/packages/system/src/utils.ts b/packages/system/src/utils.ts
index ec9a2b353..319e30c00 100644
--- a/packages/system/src/utils.ts
+++ b/packages/system/src/utils.ts
@@ -1,5 +1,5 @@
 import { equalProp } from "@snort/shared";
-import { FlatReqFilter } from "./request-expander";
+import { FlatReqFilter } from "./query-optimizer";
 import { NostrEvent, ReqFilter } from "./nostr";
 
 export function findTag(e: NostrEvent, tag: string) {