The importance of windows update?

So what is it?

It is an important part of Windows, it keeps your system updated with security and bug fixes to keep it running smooth and safe,

Windows Update - Wikipedia, the free encyclopedia

The service provides different kinds of updates. Security updates or critical updates protect against vulnerabilities to malware and security exploits. Other updates correct errors unrelated to security, or enhancing functionality.

Windows Update - Keep your PC up to date - Microsoft Windows

Updates: frequently asked questions - Windows Help

derekimo said:

It is an important part of Windows, it keeps your system updated with security and bug fixes to keep it running smooth and safe,

Windows Update - Wikipedia, the free encyclopedia

The service provides different kinds of updates. Security updates or critical updates protect against vulnerabilities to malware and security exploits. Other updates correct errors unrelated to security, or enhancing functionality.

Windows Update - Keep your PC up to date - Microsoft Windows

Updates: frequently asked questions - Windows Help

but why does it sometime affect system`s performance?

In what way? During updates or after they have been installed?

I don't get any performance problems from updating Windows.

derekimo said:

In what way? During updates or after they have been installed?

I don't get any performance problems from updating Windows.

after

There could be many reasons for performance problems, try going through this,

Optimize Windows 7

Yeah, it turned out to be bacause of too many start-ups
Thanks
Reped and marked as solved

That will do it, you're welcome.

Thanks for the rep too.

derekimo said:

That will do it, you're welcome.

Thanks for the rep too.

you deserve it