ENORMOUS performance regression in 0.29.0 & 0.29.1

Describe the bug
Performance of both 0.29.0 and 0.29.1 is FAR worse than 0.28.1. Clearing all of my config did not resolve the issue

To Reproduce
Full screen a terminal on a 27" monitor and try typing or running commands that auto update

Screenshots
Videos below of me holding down keys in the terminal to see how terrible the rendering speed is:

0.28.1

0.28.1.mp4

0.29.1

0.29.1.mp4

Environment details

kitty 0.28.1 (07bcc5ba61) created by Kovid Goyal
Darwin blerg-mac.local 21.6.0 Darwin Kernel Version 21.6.0: Mon Apr 24 21:11:17 PDT 2023; root:xnu-8020.240.18.701.5~1/RELEASE_ARM64_T6000 arm64
ProductName:	macOS ProductVersion:	12.6.6 BuildVersion:	21G646
Frozen: True
Paths:
  kitty: /Applications/kitty.app/Contents/MacOS/kitty
  base dir: /Applications/kitty.app/Contents/Resources/kitty
  extensions dir: /Applications/kitty.app/Contents/Resources/Python/lib/kitty-extensions
  system shell: /opt/homebrew/bin/zsh
Loaded config files:
  /Users/blerg/.config/kitty/kitty.conf

Config options different from defaults:
term xterm-256color

Important environment variables seen by the kitty process:
	PATH                                /Applications/kitty.app/Contents/MacOS:/usr/bin:/bin:/usr/sbin:/sbin
	LANG                                en_US.UTF-8
	SHELL                               /opt/homebrew/bin/zsh
	USER                                blerg

kitty 0.29.1 (a0341af3f8) created by Kovid Goyal
Darwin blerg-mac.local 21.6.0 Darwin Kernel Version 21.6.0: Mon Apr 24 21:11:17 PDT 2023; root:xnu-8020.240.18.701.5~1/RELEASE_ARM64_T6000 arm64
ProductName:	macOS ProductVersion:	12.6.6 BuildVersion:	21G646
Frozen: True
Paths:
  kitty: /Applications/kitty.app/Contents/MacOS/kitty
  base dir: /Applications/kitty.app/Contents/Resources/kitty
  extensions dir: /Applications/kitty.app/Contents/Resources/Python/lib/kitty-extensions
  system shell: /opt/homebrew/bin/zsh
Loaded config files:
  /Users/blerg/.config/kitty/kitty.conf

Config options different from defaults:
term xterm-256color

Important environment variables seen by the kitty process:
	PATH                                /Applications/kitty.app/Contents/MacOS:/usr/bin:/bin:/usr/sbin:/sbin
	LANG                                en_US.UTF-8
	SHELL                               /opt/homebrew/bin/zsh
	USER                                blerg

Additional context
The issue still occurs with no config.

[kovidgoyal]

I dont have a 27 inch monitor but on my hi density one at 3840x2160
pixels I see no performance regression in full screen windows. It's most likely something
specific to your GPU/monitor setup. Since I cant reproduce its hard for
me to say more. You can try bisecting to see if you can identify what
commit caused it.

My monitor resolution is also 3840 x 2160 (which is native for the monitor so should have the best performance) and I am on a Mac Studio with an M1 Ultra. Cannot imagine what about my setup would cause this.

0.29+ is unusably slow. Typing / scrolling latency is terrible. Note also that this occurs with no configuration.

[kovidgoyal]

Again without a way to reproduce or even a bisect to identify the issue there is nothing I can do to help you. Stick with 0.28 and hope that somebody else that has this issue is able to provide enough information to identify its cause. I'll leave this open for a few days so anyone else with the problem sees it.

Do you have an archive of nightly builds I can go through one by one?

[kovidgoyal]

No I dont keep old nightly builds, building kitty from source is not that hard, see https://sw.kovidgoyal.net/kitty/build/

This is really not straightforward to build (at least on a mac)... I've spent the last hour or so attempting to figure out how to get the app to build. Your instructions do not really work as is so I had to dig through the issues and run the command from #4042. Finally able to get a kitty.app output, but it reports as damaged. Any tips?

Additional note: smaller window sizes seem to perform ok, it is only as you make the window larger that performance starts to tank.

I cannot get a build that actually works though so seems like I am not going to be able to test anything.

[kovidgoyal]

I have no idea what reports as damaged means. You dont actually need kitty.app, just install the dependencies, run make debug and run the generated the kitty binary.

[ad-chaos]

You can directly run the binary by doing ./kitty/launcher/kitty from the project root

[kovidgoyal]

Another thing to check is if this depends only on window size or needs
actual full screen. Does it happen in a maximized windows as well?

I have no idea what reports as damaged means. You dont actually need kitty.app, just install the dependencies, run make debug and run the generated the kitty binary.

It means that when I double click the built kitty.app file the OS shows an alert saying it is damaged and cannot be run.

Regardingjng running make debug. None of the make commands work on macOS (and it seems like that is not just something only I am running into) without using the following crazy command from #4042.

LDFLAGS=-L$(brew --cellar librsync)/$(brew list --versions librsync | tr ' ' '\n' | tail -1)/lib python3 setup.py kitty.app --extra-include-dirs $(brew --cellar librsync)/$(brew list --versions librsync | tr ' ' '\n' | tail -1)/include

I would need to figure out how to modify that to run the equivalent of make debug I guess 😢.

Another thing to check is if this depends only on window size or needs
actual full screen. Does it happen in a maximized windows as well?

It depends on window size. I do not use the macOS full screen mode, by full screen I mean I drag the window out to be as big as the entire screen.