Performance issues after April update

Jun 27, 2018
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My laptop recently updated to the April update and since then I began to have issues. Startup takes a long time, system animations are really choppy and opening programs take ages and are really slow. Task Manager shows that there's a 99% disk usage (using 1 to 5 mb/s) by the system process all the time, and also the integrated Intel GPU shows high usage even when doing nothing in the computer. I tried reinstalling Windows through the Setting's restore option, but this didn't help as I still have all of those problems. I also tried uninstalling Avira but nothing changed. Strangely, the laptop works as it should after suspending it and waking it up. What could be causing these issues?

My laptop has these specs:
HP Pavilion Power 15 cb001-la
Intel Core i5 7300HQ
8GB RAM/ 1TB ROM
Nvidia GTX 1050 4GB
Intel HD Graphics 630