Identity Columns + Concurrency + Performance

Hi,

    We have a highly concurrent system (~20-30 concurrent requests) which basically does heavy INSERT & UPDATES on few (3 to 4 )tables.

 all these tables have IDENTITY columns which is PK for that table too.

We observe performance hit in our long running tests, where system just doesn't respond.

I see there is enough RAM and CPU on the server  but too many commands in SUSPENDED state for PAGELATCH_*

IS it bad practice to have IDENTITY in such scenario?

Please guide me.

Thanks in advance!!