Okay, my actual Internet service looks a bit slow. This not complement too well with the modest specs of the Wii Server.
I'm now configured an alternative way to navigate the site: https://no.wiichan.uwu.mx
no.wiichan.uwu.mx are hosted in a normal VPS. Now you have this option if normal Wiichan is too slow or inaccesible for you.
Both sites sync their files every 15 minutes. The replica site has not their own database, so posting and deleting posts are always managed by the main Wii Server.
Everyone can be happy now