We've noticed a difference in load time when using OVER and TOPMOST composite mode. There is also a weird..bug..maybe...when using TOPMOST.
I have python creating multiple stacks in a session where in each stack, there is the plate and the latest version of the render.
When OVER is set in composite mode the loading times are pretty slow. It is clocked at about 4-6 times slower then when setting the composite mode to TOPMOST. So I modified our scripts to use TOPMOST.
There is a side effect to this. Using topmost is super fast, but it will only cache the topmost layer in the stack. It doesn't cache the plate. Once we switch to the plate using Shift+), RV will hang for about 2-4 seconds, then begin caching the plate. Using OVER will cache both the plate and the render at the same time but is super slow.
The artists and sups have found this to be annoying :D
Is there a way to keep the extremely fast caching with TOPMOST and have the loading features of OVER? (have RV cache both/all souces while in TOPMOST mode)