Q: MacBook Pro has all kinds of probems.

In your Apps folder, there is a subfolder called Utilities. In that folder, there is an App called Activity Monitor. If you don't mind us seeing which programs are running on your computer, could you take a screen shot of the processor tab, ranked by the percentage of the processor it's taking, and a screen shot of the memory tab, ranked by the memory it's taking?

Also, is this slowness just when browsing the Internet, or in any app?

Please download and run EtreCheck, created by one of own helpers here in ASC. It is a diagnostic tool that's very useful to us in finding problems. Also it will give us further specs on your Mac. After it runs post the log file here. It will contain no personal information.

For the Safari problem try this:

Restart Safari holding the Shift key. If you still have problems Empty Caches (Safari menu > Preferences > Privacy > Remove all website data. (This will also remove history)

Please read this whole message before doing anything.

This procedure is a diagnostic test. It’s unlikely to solve your problem. Don’t be disappointed when you find that nothing has changed after you complete it.

The purpose of the test is to determine whether the problem is caused by third-party software that loads automatically at startup or login, by a peripheral device, by a font conflict, or by corruption of the file system or of certain system caches.

Disconnect all wired peripherals except those needed for the test, and remove all aftermarket expansion cards, if applicable. Start up in safe mode and log in to the account with the problem.

Note: If FileVault is enabled in OS X 10.9 or earlier, or if a firmware password is set, or if the startup volume is a software RAID, you can’t do this. Ask for further instructions.

Safe mode is much slower to start up and run than normal, with limited graphics performance, and some things won’t work at all, including sound output and Wi-Fi on certain models. The next normal startup may also be somewhat slow.

The login screen appears even if you usually login automatically. You must know your login password in order to log in. If you’ve forgotten the password, you will need to reset it before you begin.

Test while in safe mode. It will be slow, but there should be no beachballing. Same problem?

After testing, restart as usual (not in safe mode) and verify that you still have the problem. Post the results of the test.

You'd better upgrade RAM which makes your MacBook Pro faster and avoids freezings.

Please post Etrecheck as machack suggested.

The 2 places I’ve seen recommended most to buy reliable RAM are below. I have purchased RAM several times from Other World Computing and have always been very satisfied with the product and service. They have on-line instructions on how to replace the RAM. OWC has also tested RAM above what Apple states is the maximum. I now have 6GB installed on a early 2008 iMac supposedly limited to 4 GB and noticed an improvement.

Crucial

Other World Computing

I'm sorry, I was too lazy to switch my computer to English and I just translated from the name in French.

I was hoping for a screenshot like this one (the graphics are different because it's a more recent operating system).

Also, this one :

It's normal for it to change over time, but if you sort using the right column the things at the top are the most relevant, even if their order varies.

Let's take a lot at the second screen shot. The computer had 8.00 GB of RAM. It's like it was using a highway with 8 lanes. iTunes is like the biggest truck on that highway, then there is the Dock, then Numbers, etc. If I saw a truck fleet that's taking up one or two lanes I'd start asking questions : are those trucks really necessary? What do they transport?

That's why I asked for the screen shots. I'm just trying to figure out if you have useless trucks on your highway.

Buying more RAM, as some other people suggested, solves the issue in another manner : it adds lanes to your highway.

Screen shots taken from this article : Use Activity Monitor on your Mac - Apple Support