A page shows "visitors online" and looks up their countries at a slow geo provider (~200 ms).
| OPcache on | OPcache off | |
|---|---|---|
| heavy (part of Laravel loaded), every request calls the provider | /heavy/direct.php (7 visitors) | /nocache/heavy/direct.php (7 visitors) |
| heavy (part of Laravel loaded), provider answer kept in APCu | /heavy/cached.php (7 visitors) | /nocache/heavy/cached.php (7 visitors) |
"7 visitors" = ?n=7: 7 lookups per page instead of 1.