Keymagic Old Version -

CapsLock::Ctrl ; Old KeyMagic's most popular remap ScrollLock & j::Send Numpad1 ; Layer functionality LWin::Return ; Disable Windows key That gives you 90% of old KeyMagic's features with 100% modern compatibility.

Zero. It hooked into the keyboard input stack at a low level. On a Pentium 4 machine, you wouldn't notice it existed. keymagic old version

Use AutoHotkey with this 3-line script to mimic old KeyMagic: Layer functionality LWin::Return