diff --git a/modules/libpref/init/all.js b/modules/libpref/init/all.js
index 12e61ee4b534..836f56abe591 100644
--- a/modules/libpref/init/all.js
+++ b/modules/libpref/init/all.js
@@ -1428,8 +1428,8 @@ pref("network.http.diagnostics", false);
 
 pref("network.http.pacing.requests.enabled", true);
 pref("network.http.pacing.requests.min-parallelism", 6);
-pref("network.http.pacing.requests.hz", 100);
-pref("network.http.pacing.requests.burst", 32);
+pref("network.http.pacing.requests.hz", 80);
+pref("network.http.pacing.requests.burst", 10);
 
 // TCP Keepalive config for HTTP connections.
 pref("network.http.tcp_keepalive.short_lived_connections", true);
diff --git a/netwerk/protocol/http/nsHttpConnectionMgr.cpp b/netwerk/protocol/http/nsHttpConnectionMgr.cpp
index d80c1e89da66..8dd6cf599e2b 100644
--- a/netwerk/protocol/http/nsHttpConnectionMgr.cpp
+++ b/netwerk/protocol/http/nsHttpConnectionMgr.cpp
@@ -1748,11 +1748,19 @@ nsHttpConnectionMgr::TryDispatchTransaction(nsConnectionEntry *ent,
     // pacing so it can be found on cancel if necessary.
     // Transactions that cause blocking or bypass it (e.g. js/css) are not rate
     // limited.
-    if (gHttpHandler->UseRequestTokenBucket() &&
-        (mNumActiveConns >= mNumSpdyActiveConns) && // just check for robustness sake
-        ((mNumActiveConns - mNumSpdyActiveConns) >= gHttpHandler->RequestTokenBucketMinParallelism()) &&
-        !(caps & (NS_HTTP_LOAD_AS_BLOCKING | NS_HTTP_LOAD_UNBLOCKED))) {
-        if (!trans->TryToRunPacedRequest()) {
+    if (gHttpHandler->UseRequestTokenBucket()) {
+        // submit even whitelisted transactions to the token bucket though they will
+        // not be slowed by it
+        bool runNow = trans->TryToRunPacedRequest();
+        if (!runNow) {
+            if ((mNumActiveConns - mNumSpdyActiveConns) <=
+                gHttpHandler->RequestTokenBucketMinParallelism()) {
+                runNow = true; // white list it
+            } else if (caps & (NS_HTTP_LOAD_AS_BLOCKING | NS_HTTP_LOAD_UNBLOCKED)) {
+                runNow = true; // white list it
+            }
+        }
+        if (!runNow) {
             LOG(("   blocked due to rate pacing trans=%p\n", trans));
             return NS_ERROR_NOT_AVAILABLE;
         }