Ubuntu 16.04 is slow and lags

I am running Ubuntu 16.04 on my laptop HP Pavilion G6 2320tx. The specs are:

  • i5 processor
  • 4 GB RAM
  • Radeon graphics 7670m

After using it for 10-15 minutes, everything starts lagging. Clicking anything takes time to open up and everything becomes super slow.

I have done top but none of the processes is taking RAM or CPU. Everything looks normal.


Solution 1:

If your cpu gets hot because the heat sink of your cpu ist covered by dust or the cpu fan not working the cpu might be throttled to prevent overheating. See here