Add server changeset

Author: ericallam

.server-changes/batch-queue-perf-fixes.md

@@ -0,0 +1,10 @@
+---
+area: webapp
+type: fix
+---
+
+Speed up batch queue processing by disabling cooloff and increasing the batch queue processing concurrency limits on the cloud:
+
+- Pro plan: increase to 50 from 10.
+- Hobby plan: increase to 10 from 5.
+- Free plan: increase to 5 from 1.