Print server issues

We are using haproxy for printing. the servers have 600 printers of various makes and models, they are all using generic PS drivers.

We have a lot of issues with printing causing high CPU and Memory usage. a lot of jobs are timing out and a lot are just staying in the print queue with a status of " Sent to Printer".

I manage the print servers but was not the one that setup the haproxy so I don’t yet have access to any configuration files or logs.

Has anyone had any issues similar or any advise what to look for?