PHP Session Locks – How to Prevent Blocking Requests

Many people are aware that modern browsers limit the number of concurrent connections to a specific domain to between 4 or 6. This means that if your web page loads dozens of asset files (js, images, css) from the same domain they will be queued up to not exceed this limit. This same problem can happen, but even worse, when your page needs to make several requests to PHP scripts using sessions.