Steps to reproduce

vim --clean
:set ac acl=1000

Start adding content to the buffer, for example:

bla
blo

In insert mode, type bl. You can observe the autocomplete suggestions appearing after 1s. Then hit <c-n> to cycle through suggestions and you will see a 1sec delay aswell.

Expected behaviour

Delay only for suggestions to appear. Once they appeared, no delay when cycling with <c-n> and <c-p>.

Version of Vim

9.1.1638

Environment

Ubuntu 24.04
bash
Wayland/sway
foot terminal

Logs and stack traces