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Why PHP Sessions Can Overload a Busy Evolution CMS Site
When a busy Evolution CMS site shows sudden CPU spikes, developers often blame one obvious snippet such as Wayfinder, eForm, or AjaxSearch. But the original discussion behind this topic pointed to something broader: PHP
When a busy Evolution CMS site shows sudden CPU spikes, developers often blame one obvious snippet such as Wayfinder, eForm, or AjaxSearch. But the original discussion behind this topic pointed to something broader: PHP session handling itself can become a bottleneck.
Why Sessions Hurt
- every request touches session storage
- session locking can serialize parallel requests
- AJAX-heavy pages multiply that cost
- background jobs and frontend traffic compete for the same resources
What to Review
- whether all pages really need sessions
- how many AJAX calls fire on one page load
- whether bots or cron jobs generate extra concurrent load
- how PHP stores and cleans up session files
The point is not that sessions are bad. It is that session-heavy architecture can quietly become the main cost center on a VDS. Before you optimize snippets one by one, measure session behavior and request concurrency.
Adding 301 Redirects Safely in an Evolution CMS .htaccess File
How to add manual 301 redirects to an Evolution CMS site without breaking the main rewrite flow.
Ordering Custom RewriteRules Correctly in .htaccess
Why custom RewriteRule directives can stop working when they are placed below the friendly URL block in Evolution CMS.