This check should be performed on the recovery (cloud) site. Under the 'Chart Options', select Datastore and make sure to check both Read Latency and Write Latency and click OK.
By default, Zerto will start throttling I/Os if either one of the latency values goes above 40 ms. This was designed to protect the actual storage devices from overheating. This value is tweakable, but Zerto strongly recommends approaching this matter from the storage perspective to ensure the longevity of your storage devices.
If you’d like to tweak the bad I/O throttling value, please contact AssureStor support.