Set a bit more optimistic defaults based on mor emodern HW. Also use defaults better suited to proton backend.
namespace=vespa.config.content.core
## Number of separate threads that runs visitors.
-visitorthreads int default=4 restart
+visitorthreads int default=16 restart
## Default timeout of visitors that loses contact with client (in seconds)
disconnectedvisitortimeout int default=0 restart
@@ -24,10 +24,10 @@ defaultparalleliterators int default=8
## will be 16 requests to persistence layer, but only 8 will be able to execute
## at the same time, since only one operation can be executed at the same time
## for one bucket)
-iterators_per_bucket int default=3
+iterators_per_bucket int default=1
## Default number of maximum client replies pending.
-defaultpendingmessages int default=8
+defaultpendingmessages int default=32
## Default size of docblocks used to transfer visitor data.
defaultdocblocksize int default=4190208
