Excessive Publishing Times/Publishing Timed Out

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I’m having a serious issue with publishing on this website. It seems it takes literally 15-20 minutes to publish even a single new item, and sometimes it simply does not update on the live site. Sometimes it will give the error message that publishing timed out. I’m noticing in my CMS for my products that it lists them as published, but they don’t show up on the live site.

Please help, need is urgent to resolve.