bump pending latency down to 500ms, threads up to 30, for link preview DOSes

for #378

app.yaml

@@ -8,14 +8,14 @@ runtime: python39
 
 # https://cloud.google.com/appengine/docs/standard/python3/runtime#entrypoint_best_practices
 # https://docs.gunicorn.org/en/latest/settings.html#timeout
-entrypoint: gunicorn --workers 1 --threads 10 --timeout 60 -b :$PORT app:app
+entrypoint: gunicorn --workers 1 --threads 30 --timeout 60 -b :$PORT app:app
 
 # background: https://github.com/snarfed/bridgy/issues/578
 # https://github.com/snarfed/bridgy/issues/1051
 automatic_scaling:
   max_idle_instances: 1
   target_cpu_utilization: .9
-  min_pending_latency: 3000ms
+  min_pending_latency: 500ms
   max_concurrent_requests: 30
 
 inbound_services: