Identify why Google app engine is slow

Question

I developed an application for client that uses Play framework 1.x and runs on GAE. The app works great, but sometimes is crazy slow. It takes around 30 seconds to load simp

Answer 1

Use GAE Appstats to profile your remote procedure calls. All of the RPCs are slow (Google Cloud Storage, Google Cloud SQL, ...), so if you can reduce the amount of RPCs or can use some caching datastructures, use them -> your application will be much faster. But you can see with appstats which parts are slow and if they need attention :) .

For example, I've created a Google Cloud Storage cache for my application and decreased execution time from 2 minutes to under 30 seconds. The RPCs are a bottleneck in the GAE.