Best WP plugins to decrease page load time?

I use WordPress Super Cache and it works wonders for me.

Yes, Super Cache is good.

Beware though, it doesn't always work, I used it on one site and it made it worse, it was all a bit of a mystery so we took it off again...

I use a cache plugin, usually Hyper Cache or Quick Cache

Get them here: http://wordpress.org/extend/plugins/

I will add an extra confirmation and say use to use wp super cache. It work well for me but make sure you set your Permalinks the right way or it won't work.

I used to use WP Super Cache but it conflicts sometimes with a few plugins. With me it was conflicting with ReplyMe, a plugin that sends emails whenever someone replies to your comment. I wanted that installed so for decreasing page load time, I'm currently using
w3 total cache.

In order of preference

1. W3 Total Cache (head and shoulders above the others)
2. QuickCache
3. WP Super-Cache

- WP Super Cache is fine in all "normal" situations where people have "normal" hosting without shell access.

- W3TC is the better choice if you are on your own server/VPS and can use things like Xcache/memcache.

Otherwise W3TC is overkill if you dont have the resources/options on server level to take advantage of its features. You can also do BAD stuff with W3TC, for example caching objects/database to disk....which in some situations can make things way worse.

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As for the whole wordpress optimization and load-time/server optimization, this is a topic nerds/geeks could spend months on.

One problem is often that people run into trouble with load on their hosting and mistakenly believe they can use cache plugins to reduce load. (Which is only PARTIALLY true).

For example, minifying, compressing etc. will save you bandwidth and it will (usually) speed up the loading time of your sites, all right, but if your problem is CPU load (which often is the case when you run WP blogs)...you do not want to save BANDWIDTH but CPU instead...and compressing and minifying will actually increase the load on your server, not decrease it. And bandwidth is usually not really a problem!