https://wccftech.com/pixel-5-gets-a-massive-boost-in-gpu-performance-with-latest-update/

Google has finally released the April security update for the Google Pixel series; the update does bring several changes about connectivity, camera, and stability improvements for the entirety of the Pixel lineup. The update also brings performance optimizations for the Google Pixel 5 and Pixel 4a 5G. As it turns out, these optimizations have drastically enhanced the gaming performance on the latest flagship, at least as far as the reports suggest.

The first stable Android 11 update released on all Google Pixel phones saw a decline in the performance, to the point that the devices were underperforming compared to the devices sharing similar specs.