I concur with pattmatt / Gene. On an iMac running High Sierra ver 10.13.12 and using Avast Security ver 13.4, I turned off the File Shield feature on Avast and backup / upload performance increased fairly significantly and immediately (no need to restart the iDrive app). I am a new iDrive user, too (<1 week) converting from Crashplan as they exit the consumer market. My experience is the same as others in that large files on an external drive were agonizingly slow to backup / upload. We have about 2 TB of data across 3 devices.
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