My Ubuntu 12.04 LTS worked fine for few months after I installed it.
But it has now slowed down considerably. For example: initially it took about only 2 or 3 seconds to load LebreOffice Writer, but now it takes about 15 seconds to load the same.
I properly update essential security updates.
My hardware: 2GB memory and 2.3 GHz processor(Intel i5)
What may have gone wrong? Any ideas please?