When importing settings, force setting for feed refresh interval to at least 5 seconds while LMDB is slow

src/settings.rs

@@ -47,7 +47,7 @@ impl Default for Settings {
             public_key: None,
             max_fps: 12,
             recompute_feed_periodically: true,
-            feed_recompute_interval_ms: 2000,
+            feed_recompute_interval_ms: 8000,
             pow: 0,
             offline: false,
             theme: Theme {

src/storage/import/mod.rs

@@ -152,6 +152,9 @@ where
             }
             "feed_recompute_interval_ms" => {
                 if let Ok(x) = value.parse::<u32>() {
+                    // Force longer intervals for currently slower LMDB:
+                    if x<5000 { x = 5000; }
+
                     settings.feed_recompute_interval_ms = x;
                 }
             }