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Are you on shared hosting?
Shared hosting is the slowest. You have no control on performance with shared server, since you’re dependent on load / popularity / number of all the many websites hosted on the same machine. Whichever solution you apply on a shared server, it won’t matter much. The final performance of a shared plan depends solely on a single final factor – the number of other clients / websites the hosting decides to put on the same server.
The action to take is one: move to at least a virtual private server (VPS) that will have the right software configured to run things smoothly at all times.