The current behavior is when there are still unfinished folder (due to the 1000 items limit), to restart scanning immediately until all items are indexed.
When indexing finishes, then it should start respecting the schedule and scan for new emails every 60 minutes or whatever is set.
Also, for the new version we are considering to lift the 1000 items limit, which will mean that an Imap account won't stop until all items in all folders are scanned.
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Is it possible increase the number of processor cores in the virtual machine? While indexing and searching X1 runs several processes in parallel, and running all of them on a single core could be the reason for 100% CPU consumption. On a side note, there will be some internal Imap scanner optimizations in the next Beta version, which may reduce a bit the CPU and memory consumption.
Jogy