[kovidgoyal/kitty] Heavily loaded tab makes rest of the tabs janky (#2868)

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Describe the bug
When there's heavy output in one of the tabs, it makes rest of the tabs janky

To Reproduce
Steps to reproduce the behavior:

1. Run for example cat /dev/urandom (this can happen with other output-heavy software, I had it with a spammy service)
2. Open new tab
3. Hold down any key, for example the s key
4. See the jankiness of the cursor

Expected behavior
It remains smooth

Environment details
Kitty: 0.15.0

Linux Avam 5.4.0-40-generic #44-Ubuntu SMP Tue Jun 23 00:01:04 UTC 2020 x86_64
Ubuntu 20.04 LTS \n \l
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=20.04
DISTRIB_CODENAME=focal
DISTRIB_DESCRIPTION="Ubuntu 20.04 LTS"
Loaded config files: /etc/xdg/kitty/kitty.conf, /home/avamander/.config/kitty/kitty.conf
Running under: X11

Config options different from defaults:
background            Color(red=32, green=32, blue=32)
font_size             9.0
update_check_interval 0.0

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