Pages not loading / loading slowly / flashing on and off

MacBook Pro
OS X 10.5.8
Safari 5.0.6
I have had trouble with loading pages on Safari lately on my MacBook Pro. Some take forever to load, and when they do, they load either incomplete, or not at all, leaving a white screen (even when some images appeared, they disappear). I started noticing the problem the worst when I installed an app for an online focus group that I took part in. The app's purpose, I think, was to monitor my browsing, so they could collect data to see where I was shopping for phones, going on social networks, etc. When the app was connected, safari simply did not want to load; when it was off, it worked better. I have de-installed it (I think) using their de-install function. However, the problem has continued even without the app running.
Another problem that has recently appeared is that some pages (specifically, my gmail) have started to flash on and off at times. At first it happened during the use of the app, but it still occurs even after de-installing the app.
The only other thing I think might have affected my macbook is that we recently installed a time capsule as our router (I think my husband needed to upgrade our OS on one of the laptops in order to make it work? Not sure, he may just have wanted to upgrade it in order to connect our new iPads.)
I will say, that my Safari / internet experience has been rather slower than it was when I first got the computer, and has gotten a bit annoying over the last few months - not terrible, but I know it's just not working like it should.
1) What can I do to alleviate the loading / flashing issue?
2) Are there any steps I can take to "cleanse" my computer of unneccessary items that may be bogging it down?
Bonus: What do I need to do before loading a new OS on my current Pro?
Many thanks for any advice you can contribute!

Hi ...
1. Try a Safe Mode boot.
Startup your Mac in Safe Mode
A Safe Mode boot takes a longer than a normal boot so be patient.
Once you are in Safe Mode, click Restart from the Apple () menu.
Mac OS X: What is Safe Mode?
2. Reformat (erase) the hard drive. Insert the install disc while holidng down the C key.
Unfortunately, a reformat will erase everything off the drive back to factory settings but may be the only way to erdicate any left over files associated wih that app.
Before you do that, you could try searching for anything related to the app using Spotlight > Mac Basics: Spotlight
Any software that monitors online activity is bound to have an affect on a browser.

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Pages not loading / loading slowly / flashing on and off

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