Making Ubuntu run programs faster

There's this: https://sites.google.com/site/easylinuxtipsproject/speed

Make and model of computer? How much RAM have you got?

There are several possible bottlenecks that slow down a system:
1. CPU cycles
2. memory usage and swapping
3. hard disk access

ad 1.: You have to be aware that CPU-intensive computations (like crypto-mining or GIMPS prime search), never can get faster than the capabilities of your CPU.
ad 2.: As soon as the total memory used by the processes exceeds the total amount of available memory, the system starts to offload rarely used memory pages to (slower) disk space (and reloads them when needed). This is called swapping.
ad 3.: Reading/writing RAM memory is much faster than reading/writing to hard disks. If you can reduce the amount of data read from / written to hard disk, this should speed up waiting time and speed up your system.

The main question now is, which of the three items it the one that slows down your system.

Which CPU type do you have, and how much memory?

The machine has 64-bit operating system, x64 bit processor. Installed RAM is 6.00GB (5.68 GB usable) Device Manager shows Intel(R) Core(TM) i3 CPU M370 @20 GHz. This statement is repeated four times.

I never heard about an Intel i3 CPU with 20 GHz, I assume it has to read 2.40 GHz clock speed.

I'm very sorry for this mix up. The required facts are:
Intel(r) Pentium (R) CPU N3540 @ 2.16 GHz x4
Memory 7. 7GiB
OS type: 64-bit Ubuntu 18.04.1 LTS
GNOME 3.28.3
Disk: 983 GB

Now I am a bit lost. Earlier it was an Intel i3 CPU, and now it is an Intel Pentium N3540?
Are you talking about two different machines?