Cloudsync a resource hog

[sim667]

I've got some admittedly quite big cloudsync task I'd like to run in the back, but I find if I leave them running it pretty much locks up the NAS for any usage, with CPU at 100% (although processes say cloudsyncd is using 25%, as soon as I stop cloud sync task the CPU drops to very little usage overall(. Is there any possibility of setting the tasks to run only throughout the night, or to ring fence a certain amount of resource?

Also I've noticed the upload speed limits exceed the ones set in cloud sync.

This is TOS 5.1

[ColaChen]

When you have a large backup file, the synchronization process may take a relatively long time due to the huge amount of data, so z occupies more CPU resources. In the meantime, please be patient and we understand that this may cause you some inconvenience.