use_checkpoint = False

[huchenlei]

Description

According to https://github.com/lllyasviel/stable-diffusion-webui-forge/discussions/716#discussioncomment-9342877 , calls to parameters in checkpoint function is a significant overhead in A1111. However, checkpoint function is mainly used for training, disabling it does not affect inference at all.

This PR disables checkpoint in A1111 in exchange for performance improvement. This reduces about 100ms/it on my local setup (4090). The duration/it before patch is ~580ms/it.

Screenshots/videos:

Checklist:

• [x] I have read contributing wiki page
• [x] I have performed a self-review of my own code
• [x] My code follows the style guidelines
• [ ] My code passes tests