What slows down the download?

Question

linux

Hello!
I'm using Ubuntu 16.04 x64 with Unity. The last few months, the system began to slow down terribly after entering the password on the password entry screen. Those. before the input screen, the system is quietly loaded after the input, terrible brakes begin for about 5-6 minutes after entering the password. In particular, in order to launch the browser, you need to wait for some time while the system is resting. In the startup applications, everything is specially disabled in order to exclude the version of the brakes from the user application, but the system still slows down after entering the password.
Who can tell in which direction to dig, what magazines to look at? What can so force the system after the main stage of loading is completed?

Answer 1

Who can tell in which direction to dig, what magazines to look at?

Download and message logs. But first you just need to enter the console initially and see if it has brakes. To enter the console, you need to attach the number 3 to the kernel in the bootloader. That is, you just need to localize the problem, dividing the area of ​​analysis dichotomously. If the problem occurs even without graphics, then you can not look for a solution in the graphics. And if the problem occurs only with the graphics, then you can not look for a solution in some basic, console processes.

Answer 2

swap + top in the console + preload
in the worst case - a buggy unit (a bug with NVIDIA video) = driver rollback + unit rollback