A couple days ago, my whole system was running slow. I opened up Activity Monitor and Jdownloader was using 50-70% of the CPU.

I shut down Jdownloader and started it again, and it immediately shot up to 30% of CPU usage, and would spike up to 50-80% as soon as I tried downloading anything.

I restarted the machine, let it sit for 10 minutes to make sure everything was fully booted, then opened JD again. Same problem.

I tried updating JD. No updates available.

I uninstalled JD, then re-installed it. Same high CPU usage.

Tried updating the newly-installed JD. No updates available.

Please help!

Thanks in advance!

iMac (27-inch, late 2013)
3.4 GHz Intel Core I5
24 GB 1600 MHz DDR3

JDownloader
Build Date: Fri Dec 15 20:34:34 CET 2017

Java
1.8.0 u 144 (64-bit)