Do I Need WP Fastest Cache?

Hello. I am sure that some people will find the title of this post amusing, or perhaps they will consider it rhetorical. However, I am very serious about this. Let me explain.

I run a self-installed version of WordPress on my residential server. On my web server, I have enabled both “memcached” and “APC”. Despite this, connecting to and logging in to my blog using Firefox is extremely slow. In contrast, on my iPhone, the connection and login process is rather quick.

I don’t know if this is due to a problem with Firefox, or due to so many search engine bots connecting to my blog, or what, but it has really become annoying.

So I was wondering if despite the fact that I have enabled both “memcached” and “APC” on my web server, maybe I need something that is more WordPress-specific, such as your plugin. Incidentally, I have tried both WP Super Cache and W3 Total Cache in times past, and they both gave me problems and headaches.

So my question is this: do I really need to install a WordPress-specific caching system such as your plugin? Or will doing so cause some kind of conflict with “memcached” and “APC”?

Thanks in advance.