Let me see if I can shed some light on this. Here is the PC I have had for about 5 years now.Compaq Presidio, Windows 7, AMD Athlon II X2 240 Processor, 2.80Ghz, 64 bit, 3 GB ram, Nividia GForce Graphics card with a GB of ram in it also.
First thing I had learned was to go into my System Configuration and uncheck all the programs from starting when my PC boots up. I have one thing checked to start that is for my sound card I installed. If you want to use any programs you have you can start them from your start menu. Any program I have I go into settings and make sure it doesn't start when pc is started. I also uncheck that it isn't sent to the system tray when I close a program. I also make sure it asks me when to install an update. I have one thing running in my system tray. That is Norton 360. Here is a great Tutorial on what I am talking about.
https://www.youtube.com/watch?v=qpqk3qrRIrQ
Always remember to click Apply and OK. For you all that have Intel Processors do like the guy said and leave those checked in processes and start up tab.
Another tip is to uninstall any Java programs you have. You do not need Java on your PC unless, see the links. I have Iobit Uninstaller and noticed all these versions of Java on my PC. So I thought I would start from scratch by uninstalling them. I did and boy what a difference in my meter. As I said I used Iobit Uninstaller. Just using your uninstaller in your control panel does not get rid of everything and can leave some problems. Iobit's uninstaller has a power scan after it uninstalls. It will show you what was left. You then check all of them and delete them. Usually they are registry files. If you uninstall all your Java and need it somewhere, it will tell you and you can install it then. I have had no trouble browsing the web since I got rid of Java and have not been asked to install it anywhere on the web. Here are some links on that subject:
http://www.bleepingcomputer.com/forums/t/520880/java/
http://forums.cnet.com/7723-6122_102-590746/java-what-is-it-do-i-really-need-it-is-it-safe/
http://www.theguardian.com/technology/askjack/2013/feb/08/java-remove-ask-jack-technology
Last tip is I have used Advanced Systemcare Pro 7 now, for years. They have an Ultimate which has the antivirus protection. Don't get that one if you already have an antivirus program. 2 antivirus programs running at the same time will cause lots of issues and meter trouble. Shop around and get the best price. Usually some good deals that can be used for 3 pc's. There is a free version but doesn't work as well as the pro. Or maybe you can find a cracked version on You Tube or somewhere. I have found the scans that help the most everyday is the Registry Fix, make sure you go into settings and and check to use the Pro scan or deep clean. Also the Smart Ram Clean in the Toolbox tab helps. Just click on Smart Ram, then click on GO and then run the Smart Clean and then the Deep Clean. Do the Deep clean a few times.
I've helped a lot of players by using these steps while on Skype using the share screen function. Makes it so much easier what to tell someone what to do and to see what needs to be done.
I have been using the most updated flashplayer for a long time now and I have used all the browsers with little or no trouble at all. I find Comodo Dragon and Ice Dragon the best. I use them for the game only. I use IE for my default browser. The meter on IE tends to get half way down and then speeds up. So I quit using it for the game. If your using a browser for just the game, disable all the add ons or plugins, except Flash player. The Chrome based browsers use a Pepper Flash. You need to disable that. I will post a link for that also. You may have to check to make sure it is kept disabled because it was enabled once on me and I don't know how. Remember, you can disable all the plugins except the flash player.
Type about:plugins in the address bar and press enter. This will get you into the plugins to disable them.