After installing lion, my computer is running slower and having delays connecting to network

please help me resolve my problem.  after installing lion my system was running great for about a week.  suddenly it is having trouble connecting to the internet, running slow and the history pages are appearing without asking for them..  unable to get my homepage when opening up, just get a white screen. if i go to the history, i can get the homepage.  Only able to access my homepage by waiting for ever or getting it from the history.
please help

Peter, thank you for responding.  No, I am not referring to the initial start up.  I downloaded Yosemite over a week ago and feel it is running very slow when switching websites.  Also, I have experienced numerous hangups causing me to force quite much more than before.
I just cleared my Safari history (I am guessing that is what you meant by "clean the old internet-caches" and restarted Safari.  I will see how it goes.
I uses a file called "Desktop" from my IPhoto library for my desktop pictures. It contains about 20 pictures.  I configured it that way in Preferences, but it seems whenever I shut down and restart my computer it reverts to the generic picture of Yosemite.  As for the question mark and "Update Needed" showing on my startup log in screen, I think I fixed that by changing my password in Preferences.
No that I have cleared the Safari history, I will see how things go.

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