For SFSB session persistence, the load on HADB depends on the following:
Number of SFSBs enabled for checkpointing.
Which SFSB methods are selected for checkpointing, and how often they are used.
Size of the session object.
Which methods are transactional.
Checkpointing generally occurs after any transaction involving the SFSB is completed (even if the transaction rolls back).
For better performance, specify a small set of methods for checkpointing. The size of the data that is being checkpointed and the frequency of checkpointing determine the additional overhead in response time for a given client interaction.