Ok, first of all, let me first say that I am completely dumbfounded why I can't login to this board on any other computer. It says my username doesn't exist, and I can't even do a forget password as it says my account doesn't exist. I try to register and it says it exists. What gives? I had to hunt down one of my few computers in hopes I was still signed in (thankfully I am!).

ANYWAY, I just fresh installed Kubuntu 17.10 onto one of my AMD Athlon II machines, which uses a Radeon Mobility 4250 I believe. It's a little dated, but still gets the job done.

When I cold boot and log in, KWin's performance appears to be rather sloppy, choppy, and downright odd. For example, if I open up Konsole, clicking the application launcher has it slide out choppily, it's just not good. Maximizing the Konsole, the animation is even choppy.

But here's where things don't make sense. Simply logging out, and logging back in, fixes ALL of that. Alternatively, I can just go to Konsole and type in kwin --replace, and that also fixes this performance issue. Thinking it's a bad install, I completely erased the disk and installed it again, nope, same issue.

Only this laptop is exhibiting this behavior. I'm at a loss, and have spent upwards to over half my day already trying to fix this problem, and I honestly can't figure it out anymore as to why it's doing this. I shouldn't need to log out and back in, or relaunch KWin, just to fix this sluggishness. For now, I simply put a shortcut in my launch that I can click on when I cold start, but this is admittedly annoying.

Having used KDE since 1.0, this has GOT to be the oddest thing I've seen.