Delayed Response by SyncGW randomly

i did post in couchbase forum as I am seeing the indexing message in Couchbase

But I want to know from syncgateway that there is no issue with syncgateway and it is only with couchbase…now i am not sure whether performance bottleneck is due to syncgateway or couchbase…

Can I do something to isolate the issue whether it is syncgateway or CBS?