RTX 4060 with SageAttention

On my RTX 4060 Laptop, I am generating each second of video in about 4:09 (around 10s/it). It is taking around 16 mins for a 5 sec Video (with Sage Attention). First of all, great job, to the Developer, this is Amazing !

But With Sage Attention, there is a lot of variation going on throughout the 25 images being generated at each pass:
- It starts at about 20 s/it for the first 4 frames
- It keeps getting progressively quicker from Frame 4 onwards, until I'm down to 5s/it by Frame no 18 and it looks as if the whole pass is gonna finish in less than 3 mins.
- But then it suddenly slows down, with image 19 - 25 generating progressively slower, going from 5 to 6, 7, 9 and then 10it/s at Frame 25.

The VRAM and RAM stay at the same usage throughout the pass but the speed nosedives at the very end. If it did not I could be getting whole 5 sec video in around 10 mins but due to this I end up at 16 mins for the 5 seconds. Is this the normal behaviour for Sage Attn ? Or am I getting bottlenecked somewhere at the end of each pass ?

The report contains RTX 4060 Laptop timing observations for SageAttention but names no source files or tests. Start by reproducing the 25-frame pass with the reported hardware and settings, then trace the per-frame timing and memory behavior. Done means identifying whether the late-pass slowdown is expected or a reproducible bottleneck.

Written by the indexing model from the issue text.