In general, to control checkpoint in order to bypass client timeouts during long checkpoints when inserting triples into the Virtuoso server, one must disable automatic checkpoint by:

SQL> checkpoint_interval (0);

and also to make sure the AutoCheckpointLogSize is off. Then can be performed checkpoint whenever the client wants using the 'checkpoint' command.

However the need of cache check is not needed unless instance shows regular errors. By default the cache check is disabled.

Virtuoso offers a new option in the Virtuoso ini file to enable the check of page maps: PageMapCheck , 1/0 default 0:

-- Virtuoso.ini

...
[Parameters]
...
PageMapCheck  = 0
...

Also customer can add CheckpointSyncMode = 0 in order to disable sync during checkpoint to speed the operations.