Well, use task manager for basic performance monitoring
Here are some other things:
Install chromium which is open source chrome: sudo apt-get install chromium-browser
Flash for the last four sites in the world that use it sudo apt-get install pepperflashplugin-nonfree
VLC seems way better than the native player sudo apt-get install vlc with all the codecs you will ever need sudo apt-get install xubuntu-restricted-extras libavcodec-extra

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