Massimo I just created a new thread for this problem. Failed requests appear with Rokcet and with wsgi as well. You can simply benchmark FORM examples running on your site. The same for my local tests.
See below: -n = number of requests -c = number of concurrent requests debian:~# ab -n 100 -c 10 http://web2py.com/examples/form_examples/form This is ApacheBench, Version 2.3 <$Revision: 655654 $> Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/ Licensed to The Apache Software Foundation, http://www.apache.org/ Benchmarking web2py.com (be patient).....done Server Software: Apache/2.2.8 Server Hostname: web2py.com Server Port: 80 Document Path: /examples/form_examples/form Document Length: 24043 bytes Concurrency Level: 10 Time taken for tests: 14.161 seconds Complete requests: 100 Failed requests: 19 (Connect: 0, Receive: 0, Length: 19, Exceptions: 0) Write errors: 0 Total transferred: 2449290 bytes HTML transferred: 2404325 bytes Requests per second: 7.06 [#/sec] (mean) Time per request: 1416.149 [ms] (mean) Time per request: 141.615 [ms] (mean, across all concurrent requests) Transfer rate: 168.90 [Kbytes/sec] received