Too many simultaneous requests.
WHAT IT MEANS
Your account has a limit on concurrent PHP processes. Requests beyond it are refused, producing errors for visitors.
WHAT CONSUMES THEM
Each uncached page view holds a process while it runs Long-running requests hold them longer Bot traffic consumes them like any visitor File synchronisation clients, if you run such an application
THE COMMON CAUSES
No caching. Cached pages are served without a PHP process at all, which is why caching resolves this outright for most sites. Slow pages, since each holds its process longer A traffic spike Bots crawling aggressively
THE FIXES IN ORDER
Enable page caching Make slow pages faster, so processes are released sooner Block abusive bots Move heavy scheduled work to quiet hours
WHY CACHING MATTERS MOST HERE
It is the difference between every visitor consuming a process and almost none doing so.
IF IT PERSISTS
Genuine concurrent traffic beyond your plan. Open a ticket with your usage graphs.
