The only setting I recommend to tweak on a Pi 1B is the "memory split":
https://www.raspberrypi.com/news/new-sd-card-image/
https://www.raspberrypi.com/documentation/computers/configuration.html#memory-split-nonint
On below link, scroll down to "Steal some memory from the GPU" to see how I've done that for the Bookworm release:
Not sure if anything has changed with the Trixie release though!
Before tweaking:
$ vcgencmd get_mem gpu; vcgencmd get_mem arm
gpu=64M
arm=192M
After tweaking and rebooting:
$ vcgencmd get_mem gpu; vcgencmd get_mem arm
gpu=16M
arm=240M