The time taken for the character to accelerate to the BaseSpeed should stay constant between framerates, however, lower framerates accelerate much slower than higher framerates.
Demonstration:
The GUI in the following video shows the current keys being pressed.
The video was uploaded directly to the ticket by a Roblox Staff (@Focia19) due to file size!
Reproduction File:
Vary framerate using external programs.
Repro.rbxl (56.2 KB)