3 simple tips to noticeably reduce system lag.

[JJFUSA]

Based on my personal experience, I would like to share how to quickly and drastically reduce lag, on my ASUS A15 TUF it works like a charm:

Completely disable Paging File:
If your computer has 32Gb or more RAM, then there is no need for any extra memory, even RAM hungry monsters like Star Citizen and Microsoft Flight Simulator 2020 run perfectly fine on 32Gb / No Paging File, reducing I/O Disk operations is essential for better performance.

Disable Write Caching:
If you have a NVMe SSD, deselect "Enable write caching on the device" to turn Write Caching Off, Windows could "decide" to cache disk at any moment during the gameplay and that would result in lag, plus NVMe are fast enough by their own nature and there are no benefits of having an additional layer to their operation, try it and feel the difference.

Disable on-board audio:
Instead, just get any USB dodge DAC/AMP if you have a laptop or Sound Card if you have a desktop, I did it recently, and I was shocked by improvement of overall performance and reduction of the mouse lag.

[Chief Blur Buster]

Great common-sense lag reduction tips, with some caveats. There's literally uncountable millions of lag problems, especially from the game server.

But these are definitely low lying apples on at least a significant minority (let's imagine, 5% or 10%) of systems!

Completely disable Paging File:
If your computer has 32Gb or more RAM, then there is no need for any extra memory, even RAM hungry monsters like Star Citizen and Microsoft Flight Simulator 2020 run perfectly fine on 32Gb / No Paging File, reducing I/O Disk operations is essential for better performance.

Correct -- This is excellent advice for 32 gigabyte RAM systems. The pagefile is a microstutter-creator.

Don't do this on non-single-purpose 16 gigabyte systems or less, unless you're really wanting to run it in kiosk mode (no other apps), game software has a nasty habit of crashing when running out of memory -- save your game often if playing solo.

Disable Write Caching:
If you have a NVMe SSD, deselect "Enable write caching on the device" to turn Write Caching Off, Windows could "decide" to cache disk at any moment during the gameplay and that would result in lag, plus NVMe are fast enough by their own nature and there are no benefits of having an additional layer to their operation, try it and feel the difference.

This can be helpful on some SSDs, but not necessarily all. This reduces microstutter on many systems, but has no effect on mine. I have those high-end Samsung SSD's which probably has fast DRAM cache and SLC cache, so the write caching will flush really fast to the DRAM and SLC.

But if you do software development in Visual Studio and compile thousands of source code files, write caching makes a noticeable difference to SSD performance.

However, disabling write caching also improves data security on a SSD, so crashes are less likely to damage an SSD.

Disable on-board audio:
Instead, just get any USB dodge DAC/AMP if you have a laptop or Sound Card if you have a desktop, I did it recently, and I was shocked by improvement of overall performance and reduction of the mouse lag.

Yep. 1 out of 10 times THIS was the users' biggest cause of input lag. So many cheap crap motherboards out there! I've seen onboard audio add a lot of input lag. Some of it is good but if you have a pile of poo masquerading as onboard audio, definitely disable and use a USB soundcard instead (Also another tip: Dedicated USB hub such as a PCIe USB card to keep high-poll mouse separate of the USB root hub used for audio). And even same for onboard Ethernet, too if it's one of the crappier chips.

Spend more on a good motherboard, you're likely to run into this. But it's sometimes a lottery how the motherboard makers optimize the efficiency of their onboard USB, of their onboard audio, of their onboard Ethernet, etc. One weak link can ruin a day until you externalize them (buy an external adaptor and connect to a dedicated USB root hub).

[jorimt]

Completely disable Paging File:
If your computer has 32Gb or more RAM, then there is no need for any extra memory, even RAM hungry monsters like Star Citizen and Microsoft Flight Simulator 2020 run perfectly fine on 32Gb / No Paging File, reducing I/O Disk operations is essential for better performance.

This is generally fine, but you typically still need to leave at least ~16MB, or Windows can't create crash dumps.

I personally leave mine on auto, which allocates 2048 MB on my particular system (specs in sig).