Is there a way I can uninstall Mylyn from Eclipse PDT. It comes pre-installed and I don't think I am going to use it. So I want to take all the additional plugins out of my eclipse copy as my IDE is already running sluggishly.
The uninstall process is explained in the Mylyn FAQ
We recommend uninstalling in Eclipse via the
Help → Software Updates → Manage Configurationdialog. If you get an error message when trying to uninstall, you will need to first uninstall dependencies that use Mylyn. These include things like the Subclipse Mylyn integration and the Bugzilla Connector.You can also uninstall manually by deleting all of the Mylyn plug-ins and features from the eclipse/plugins and eclipse/features directory make sure to delete all of the plug-ins and then restart Eclipse with the
-cleanoption (e.g. by inserting it into a shortcut or the eclipse.ini file.
Recent versions of Eclipse might not allow uninstalling mylyn: see bug 327157:
I am sorry to hear that you wish to uninstall Mylyn. It is correct that most packages provided by Eclipse only have a single root feature and do allow individual components to be uninstalled.
I can assure you that Mylyn has an negligible impact on Eclipse if it is not used. If you follow the following steps none of the Mylyn plugins will get loaded on startup:
Additionally, you can remove Mylyn UI contributions under General > Capabilities by disabling the Tasks category (not all Eclipse packages provide that option).
Alternatively, you can use an Eclipse package such as the SDK that does not include Mylyn by default. Eclipse also provides a bare-bones RCP download that only has required components which can be extended as needed.
That means a manual uninstall as documented by Dawid Drozd is the only option: