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I’m trying to figure out if my current shared hosting plan is actually causing my site to slow down during traffic spikes, or if it’s something else in my stack. I’ve checked plugins and image sizes, but the load times still crawl whenever I get a surge of visitors, which makes me wonder if I’m just hitting a resource ceiling.

I was in the same boat last month. during traffic bumps the pages would stall for ten seconds and then load, and I kept blaming plugins. Even after trimming a bunch of those, the slowdowns persisted on a shared host, so it started to feel like a resource ceiling more than a bug.

I actually opened the host's metrics panel and watched CPU and IO wait across a full day of spikes. MySQL threads spiked when traffic did, so I tuned a couple of slow queries and added basic PHP caching. It shaved off some of the crawl, but it didn't fix the worst spikes completely.

I also tried adding a lightweight CDN cache and made sure static assets were served from cache. The static pages got noticeably faster during spikes, but the dynamic pages still dragged when the traffic surged. I started debating if a plan upgrade was worth it.

Are you sure the bottleneck is the site under load and not something external like a DNS or CDN warmup?

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