Probbaly not. If anything, Win7 has a bit more overhead than XP. Try a couple things to help with the speed:
Make sure your system doesn't have a virus or malware slowing things down. Update your virus pgm. and run a full scan. Then run Malwarebytes: http://www.malwarebytes.org/mwb-download/
If your machine is full of bloatware from the factory that you don't use, uninstall the stuff.
Check your tray for stuff you can disable.
Run CCleaner and do the Clean and Registry both. https://www.piriform.com/ccleaner/download