–> IMPORTANT UPDATE <–
As a result of my post I have gotten a LOT of responses from folks wanting to know how to speed up their site.
BEFORE I start going down the path of caching there are a LOT of preliminary fixes that most sites must do.
So if you are interested in really fixing your site,
1. Go to https://www.webpagetest.org/ and test your site.
2. Once the test is complete, click on the WATERFALL IMAGE that is generated to see the details of where many of your problems are.
3. Start addressing and correcting those first.
For example, I had one person who asked for help but their real problem was less about caching than about the silly JQUERY install that WordPress does. Solution?
Just add this plugin: https://www.ads-software.com/extend/plugins/use-google-libraries/
This adds the Google Libraries plugin to your site. It will REALLY help with your load time. It is served from Google’s site. And it is the most compressed and up to date. On top of that, MANY large sites use it so it is very likely that your users will already have it cached in their browser even the first time they visit your site.
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Another person was so in love with their FLASH picture changing that they would not do anything about it. Another one was in love with their Google Partner plugin which was taking up LITERALLY 30 seconds of load time. Whoever did that plugin created a bunch of JUNK! But they are hooked on it and won’t change it.
There are a LOT of fixes you should do before EVER putting in a caching program.
So, please check out your site first and be sure you are willing to fix some of what you find before going down the caching route. If you have trouble I’m okay with helping on that too. But if you don’t want to address the underlying issues with your site first then there is not a lot that many caching programs can do well for you.