Laggy scrolling using railwaycat/emacs-port

[landaire]

I know this has been discussed many times over but I think that this is a deeper problem with Spacemacs in some way.

Here's a video of out of the box scrolling (no emacs plugins): https://youtu.be/05Svv4Erkz8
And with spacemacs, same file: https://youtu.be/fIpGkjX3dVk

The difference is pretty clear. The D layer I think is just poorly optimized or something since there's other issues with it and scrolling is slightly better for some random Go file I tried.

Does anyone have any tips for debugging what might be the offending layer(s)? Even with all extra packages disabled I still get some slight lag when scrolling.

It's worth noting that I do not have the same issue when building from HEAD with brew install emacs --HEAD --use-git-head --with-cocoa --srgb... but that doesn't give pixel scrolling.

System Info

• OS: darwin
• Emacs: 24.5.1
• Spacemacs: 0.105.0
• Spacemacs branch: develop (rev. dee5d73)
• Distribution: spacemacs
• Layers:

(auto-completion better-defaults emacs-lisp git
                 (shell :variables shell-default-height 30 shell-default-position 'bottom)
                 syntax-checking version-control d go rust elixir swift yaml latex markdown osx spacemacs-layouts)

[louwers]

Native scrolling with mac-emacsis indeed very jerky and nearly unusable. Some related discussion here. I get the same result regardless of language.

[landaire]

Wow, I had seen that thread before but figured that I should be getting similar results with Fira Code. I just tried Fira Mono and got better results. Messing with unicode symbols doesn't seem to have a big affect.

* just did a fresh restart instead of SPC f e R and wow, huge difference.

[github-actions]

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