Dolphin crashes if the drive's throughput is saturated

SUMMARY
Copying files from faster drives to slower ones, maxes out their throughput and causes Dolphin to crash if you try to browse folders on the slower drive.
reproducibility: always

STEPS TO REPRODUCE
1. Copy something from a faster drive to a slower
2. Try to browse folders on the slower drive

OBSERVED RESULT
Dolphin crashes

EXPECTED RESULT
Dolphin remains usable

ADDITIONAL INFORMATION
Copying from an SSD or 3.0 USB to HDD causes a crash, however copying from 2.0 USB to HDD doesn't.
Both the SSD and the USB remain usable during copying, but browsing the HDD crashes