A can find at least 5 related issues:
MB-6172 XDCR: High CPU utilization on destination nodes
MB-7076 xdcr with views eats all CPU resources making this case slow and unusable
MB-6107 query performance degrades over time on spinning HDD
MB-7074 xdcr: data compaction doesn't catch up
MB-6973 setup wizard picks 80% bucket size (too big) by default
In short we need additional CPU, memory and disk resources for views and extra CPU resources for XDCR.
Having all issues gathered together we can come to final recommendations for our customers and users.