I am having performance issues with Lemnis Gate.

Verify Integrity of Game Files (Steam)

Right click Lemnis Gate in your Steam Library list. Click Properties, go to Local Files in the window that pops up, and click Verify Integrity of Game Files, and let the process complete.

Reinstall Drivers

Please check that all Windows updates have been applied and that all of your system drivers are fully up to date.

Updating drivers for your graphics card and some peripherals isn't possible through the automatic Windows Updater & must these be acquired by the manufacturer's website.

For NVIDIA cards, you can get the drivers at www.nvidia.com and for ATI cards at www.amd.com. Drivers for Intel HD GPUs can be found at www.intel.com.

Turn off background recording

Xbox Game DVR
While in-game press Windows + G to bring up the game bar.
With this showing, you should be able to select the settings "Cog".
From here please uncheck "Record game in the Background".

You can find out more about this here: http://support.xbox.com/en-GB/xbox-on-windows/social/record-game-clips-game-dvr-windows-10

NVIDIA Shadowplay
To turn off Shadowplay you will need to open NVIDIA GeForce Experience.
With this open please click on the settings "Cog" in the top right.
Click the toggle to disable the share feature.

You can find out more about this here: 

http://nvidia.custhelp.com/app/answers/detail/a_id/4228/~/disabling-the-geforce-experience-share-in-game-overlay

Clear Cache

Turn off your PlayStation, do not enter rest mode.

Once the indicator light on the PlayStation has stopped blinking and is completely off, unplug the power cord from the console.

Wait 30 seconds.

Plug the power cord back into the PlayStation and start it up again as normal.

Check for a software update

Go to Options

Select System

Navigate to System Software Update

Rebuild Database

Power off your PlayStation, do not enter rest mode.

Hold the power button down until you hear two quick beeps.

Connect your DualShock 4/Dualsense controller to the USB slot in the front of the PlayStation.

Scroll down in the menu until you reach option 5, Rebuild Database.

Reinstall Game

Highlight the game and press Options

Delete the game

Navigate to your Library, select the game and download

Clear Cache

Turn off your Xbox.

Once the the Xbox is completely off, unplug the power cord from the console.

Press and hold the power button on the Xbox several times to clear the cache.

Plug the power cord back into the Xbox and start it up again as normal.

Check for a software update

Go to Profile and System, then select Settings

Select System, then select Updates

Select Console Update if one is available.

Reinstall Game

Select the Xbox button on the game controller to enter the main menu.

In Games & Apps, select Games.

Select the game you wish to delete, and select Uninstall.

To reinstall, go to the Games & Apps screen once more, find the game, and select it under the Ready to Install menu.