performance tests: decrease values to adapt to faster hardware

6 jobs for master in 0 seconds
Status Job ID Name Coverage
  External
passed ERP5.CodingStyleTest-Master

02:27:27

passed ERP5.PerformanceTest-Master

00:23:49

failed ERP5.UnitTest-Master

03:14:59

failed ERP5.UnitTest-Master.Medusa

03:07:58

passed SlapOS.Eggs.UnitTest-Master.Python2

00:36:57

passed SlapOS.Eggs.UnitTest-Master.Python3

00:51:19