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