System has slowed down considerably after updates from Apple. Is SyncServer the culprit?

I use MacBook with preinstalled OS Leopard since April 2009. I have also regulalry updated my computer system using the Software Update application. However, since my last update on 12th Aug 2011, I have noticed that my system has slowed down. There is long pause between every character I type, delay in switching applications, battery dries out quicker, slow response to every command.
I have started facing this problem after updating following software like iTunes 10.4, Safari 5.0.6, Migration Assistant Update for MAC OS Leopard & Quick Time 7.7 from Software Updater. Although, my OS is still leopard.
I noticed on the Activity Monitor that syncserver is using majority of my RAM and reappers even if I stop the process. Some of its subprocess like AddressBookSync also appears and consumes lot of memory. Is this the problem? Though, I never noticed earlier what size it consumed.
I use Microsoft Office suite for Mac and have also checked and deselected all sync services. Yet, the Process (PID 305) continues to appear in Activity Monitor.
I am no techie, and would appreciate quick help to resolve this issue.
Thanks!

I was just about to write the same problem, but I don't have VMware; my laptop is late 2008 was running Snow Leopard (uptodate version).
I've scientific softwares so probably would require a clean re-installation of ML. I MUST MENTION HERE that those software which were written for PPC will NOT work on ML. Just found out that one of my important softwares version won't work on ML; need $500  to upgrade that software .
Therefore, I'd also want to know how can I go back to SL.
I'll let you know how clean re-installation has worked.

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    The application has gone live and its on production, the same application is on pre-prod and UAT, system testing and integration environments.
    The infopath form used to work very well on all these environments before we installed sharepoint 2010 sp2. but the moment we installed sharepoint 2010 sp2, the infopath forms have slowed down.
    Microsoft has acknowledged that there is an issued with sharepoint 2010 sp2 and infopath form performance, but they are not able to provide an appropriate fix on this.
    We have another environment where there is no sharepoint 2010 sp2 applied only sp1 is applied and the infopath form works very well within fraction of seconds.
    So your point no. 1 and 2 and 3. does not reveal anything. Fiddler does not give any detailed component by component breakup where the time is taking more.
    The form used to work very well before we applied sp2.
    I want to know a tool that gives me exactly component by component grant chart kind of breakup of time taken when the infopath url is requested on the browser.
    Thanks
    ram
    Thanks Ram

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