CSGOTWEAKS

WINDOWS SETTINGS

Windows settings:

Visual effects:

Go to Start - Computer - Properties - Advanced system settings - Advanced - Performance - Settings - Custom - Disabling it all gives the best performance.
Visual effects:

Disable XBOX DVR

Enormous input lag. Here is reg file that permanently disables it.
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Disable unnecessary services

Typically, a lot of unnecessary services are working in Windows by default, so disable all of them (if possible). The link below is a registry file for disabling some services.
download

Easy Services Optimizer (eso)

Small programm with different presets (safe, extreme etc). Choose extreme at bottom, then service - check all - File - Apply services (orCtrl+S), reboot.
download
Easy Services Optimizer (eso)

Turn off telemetry, delete application's Metro.

By default there are plenty tasks in Windows 10 in the task manager, that send data about operation of the system, many Metro applications (I haven't started them since start of Windows 10) and other garbage. Fortunately, craftsman created DWS (Destroy Windows Spying). Set the settings as in the screenshot. ATTENTION!: Do not tick "Add spyware domains to hosts" - Skype will stop working :).
download
Turn off telemetry, delete application's Metro.
Turn off telemetry, delete application's Metro.

Blackbird - such as DWS, u can use both:

Without going into too much detail, Blackbird employs some known and less-known techniques to fully disarm Windows while leaving the smallest possible footprint.
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Blackbird - such as DWS, u can use both:

Clear startup and not loading waste services:

Press WIN+R, type msconfig.exe, go to the "Services", tick "Hide all Microsoft Services", remove the tick from everything we don't use, except anti-cheats, etc.
Clear startup and not loading waste services:

Sound settings:

Set your bitrate to 16bit 44.1k, anything higher can cause a delay. Go to start - control panel - sound - choose ur device - properties - advanced. Same with Recording devices. Disable crystallizer, eax and other things.
Sound settings:

Disable unused devices in device manager:

Right mouse button on PC - Device manager - sound video and game controllers - Nvidia High Definition Audio - right mouse button - disable. U can disable all unwanted devices, but u do it at ur own risk.
Disable unused devices in device manager:

Nvidia driver settings:

to NVIDIA Control Panel - Manage 3D Settings.
Maximum pre-rendered frames - Set to 1
Power management mode - Set to Prefer maximum performance
Texture filtering - Quality - Set to High performance
Vertical sync - Set to Off
Shader cache - Set to Off
Multidisplay - Set to Single display performance
Virtual Reality pre-rendered frames - Set to 1
What AMD users shall do? Look for the same settings in you Control Center, change them in the same way, maybe later I will add screenshots with the AMD drivers setup.
Nvidia driver settings:
Nvidia driver settings:

Power options:

Go to Start - Control Panel - Hardware and Sounds - Power Options - Set to High Performance.
Power options:

useplatformclock:

this command turns on/off HPET (High Precision Event Timer) at the Windows level, you can achieve interesting results in combination with turning on/off this option in the BIOS. For enabling HPET in Windows press WIN+R, type cmd.exe, run as administrator, then type "bcdedit /set useplatformclock true"
Reboot. To turn it OFF type:
"bcdedit /deletevalue useplatformclock"
useplatformclock:

Windows Defender:

This one is hugely noticeable. Go to the start menu, in the search box type "Windows Defender" and open it. Go to Tools/Options, then go to the last tab at the bottom and uncheck the box labeled "Use this Program". Or u can use services.msc and find it here, WIN+R on desktop, type services.msc, find windows defender and disable it. U can remove it from autostart in Ccleaner.
Reg file to disable Windows Defender Security center

Disabling core parking:

Relevant for windows 7 (on win10 disabled by default). Download CPU Core Parking manager, raising the slider to 100%, Apply, reboot.
download
Disabling core parking: