Reread what you wrote :) Once you lower the the db io issues, rendering does become the bottleneck. Not really. Sending and receiving data to/from the browser

Reread what you wrote :) Once you lower the the db io issues, rendering does become the bottleneck. Not really. Sending and receiving data to/from the browser becomes the bottleneck. If it takes 50ms to receive the query from the browser, 0.1ms to retrieve the data from the cache, 10ms to render it, and another 50ms to send it back to the browser - the bottleneck is now network communications with the browser. There are, unfortunately, limits on how much that can be improved.