SiN has an issue where the default "walk" movement speed value only applys to foward and backward movement.

Sidestep or strafe has a default movement speed matching "run".

This makes for some hard accurate shooting.

Solution.

Put this in your autoexec.cfg to match sidestep speed to walking value.

cl_sidespeed "200"

*Note Set "auto run" to off in the game controls menu as sidestep speed will always be at value "200"

This is a compromise solution.