It takes about 300ms after a three finger drag for it to take effect. I notice the delay because an actual click drag releases instantly
Anyone know of a hack to get rid of it??
You don't need to wait for the drag to be released before moving the cursor again. If you move the cursor with just one finger after the three finger drag, the drag will be released instantly.
I have also been frustrated by this problem and found a github app that fixes the annoying delay.
Now I can copy and paste without the delay!
disclaimer: I have not association with the github, just thought I would share the solution I found