diff --git a/packages/system/src/query.ts b/packages/system/src/query.ts
index 7e3058d5..946a1b8e 100644
--- a/packages/system/src/query.ts
+++ b/packages/system/src/query.ts
@@ -168,6 +168,11 @@ export class Query extends EventEmitter<QueryEvents> {
 
   #log = debug("Query");
 
+  /**
+   * Compressed cached trace filters
+   */
+  #cachedFilters?: Array<ReqFilter>;
+
   constructor(system: SystemInterface, req: RequestBuilder) {
     super();
     this.request = req;
@@ -193,7 +198,6 @@ export class Query extends EventEmitter<QueryEvents> {
   addRequest(req: RequestBuilder) {
     if (req.instance === this.request.instance) {
       // same requst, do nothing
-      this.#log("Same query %O === %O", req, this.request);
       return;
     }
     this.#log("Add query %O to %s", req, this.id);
@@ -214,7 +218,10 @@ export class Query extends EventEmitter<QueryEvents> {
    * Recompute the complete set of compressed filters from all query traces
    */
   get filters() {
-    return this.#tracing.flatMap(a => a.filters);
+    if (this.#system && !this.#cachedFilters) {
+      this.#cachedFilters = this.#system.optimizer.compress(this.#tracing.flatMap(a => a.filters));
+    }
+    return this.#cachedFilters ?? this.#tracing.flatMap(a => a.filters);
   }
 
   get feed() {
@@ -432,6 +439,7 @@ export class Query extends EventEmitter<QueryEvents> {
       c.off("closed", eoseHandler);
     });
     this.#tracing.push(qt);
+    this.#cachedFilters = undefined;
 
     if (q.syncFrom !== undefined) {
       c.request(["SYNC", qt.id, q.syncFrom, ...qt.filters], () => qt.sentToRelay());
diff --git a/packages/system/src/request-builder.ts b/packages/system/src/request-builder.ts
index 69abbe50..77d1e05d 100644
--- a/packages/system/src/request-builder.ts
+++ b/packages/system/src/request-builder.ts
@@ -59,6 +59,7 @@ export class RequestBuilder {
   #builders: Array<RequestFilterBuilder>;
   #options?: RequestBuilderOptions;
   #log = debug("RequestBuilder");
+  #rawCached?: Array<ReqFilter>;
 
   constructor(id: string) {
     this.instance = uuid();
@@ -83,17 +84,20 @@ export class RequestBuilder {
    */
   add(other: RequestBuilder) {
     this.#builders.push(...other.#builders);
+    this.#rawCached = undefined;
   }
 
   withFilter() {
     const ret = new RequestFilterBuilder();
     this.#builders.push(ret);
+    this.#rawCached = undefined;
     return ret;
   }
 
   withBareFilter(f: ReqFilter) {
     const ret = new RequestFilterBuilder(f);
     this.#builders.push(ret);
+    this.#rawCached = undefined;
     return ret;
   }
 
@@ -105,12 +109,15 @@ export class RequestBuilder {
     return this;
   }
 
-  buildRaw(): Array<ReqFilter> {
-    return this.#builders.map(f => f.filter);
+  buildRaw(system?: SystemInterface): Array<ReqFilter> {
+    if (!this.#rawCached && system) {
+      this.#rawCached = system.optimizer.compress(this.#builders.map(f => f.filter));
+    }
+    return this.#rawCached ?? [];
   }
 
   build(system: SystemInterface): Array<BuiltRawReqFilter> {
-    let rawFilters = this.buildRaw();
+    let rawFilters = this.buildRaw(system);
     if (system.requestRouter) {
       rawFilters = system.requestRouter.forAllRequest(rawFilters);
     }
@@ -124,7 +131,7 @@ export class RequestBuilder {
   buildDiff(system: SystemInterface, prev: Array<ReqFilter>): Array<BuiltRawReqFilter> {
     const start = unixNowMs();
 
-    let rawFilters = this.buildRaw();
+    let rawFilters = this.buildRaw(system);
     if (system.requestRouter) {
       rawFilters = system.requestRouter.forAllRequest(rawFilters);
     }
@@ -133,7 +140,7 @@ export class RequestBuilder {
       const ret = this.#groupFlatByRelay(system, diff);
       const ts = unixNowMs() - start;
       if (ts >= 100) {
-        this.#log("slow diff %s %d ms, consider separate query ids, or use skipDiff: %O", this.id, ts, ret);
+        this.#log("slow diff %s %d ms, consider separate query ids, or use skipDiff: %O", this.id, ts, prev);
       }
       return ret;
     }