I had recently encountered a performance issue with odoo 8. Since last week, the loading time has increased considerably in odoo back office. 

I ran a test with xenu wich returned many timeouts. I ve also found  a lot of workers timeouts errors in my odoo logs, like this : 

ERROR ? openerp.service.server: Worker (4362) timeout

 The odoo instance is running with 4GB RAM, and here's the multiprocessing configuration :

workers = 5

limit_request = 32768

Any ideas? What do these error messages mean?

Thanks in advance 

Franck