The first thing you should consider is upgrading your hardware.
Your PC is simply not any better than its components and thus optimizations can only take you some of the way to the stable FPS every player desire.

Minimum system requirements

Let's run over the minimum requirements at first. This is what you at least should own to even run and play the game without major issues.

OS Processor Memory Graphics DirectX Network Storage
64-bit Windows 7, Windows 8.1, Windows 10 Intel Core i3-4340 / AMD FX-6300 6 GB RAM Nvidia GeForce GTX 660 2GB / AMD Radeon HD 7850 2GB Version 11 Broadband Internet connection 30 GB available space

Recommended system requirements

With the recommended build you will be able to play the game at optimal settings and with a fair performance hitting around 60 FPS.

OS Processor Memory Graphics DirectX Network Storage
64-bit Windows 7, Windows 8.1, Windows 10 Intel Core i5-6600K / AMD Ryzen 5 1600 8 GB RAM Nvidia GeForce GTX 1060 3GB / AMD Radeon RX 580 4GB Version 11 20 Mbit 30 GB available space

You can find different recommended builds on our Realm Royale Gear page.

Increase FPS

In-game settings

First things first is to set the in-game settings correctly and lower everything possible.

Video Settings Value
Resolution scale 95
Anti-aliasing Off
World detail Lowest
Shadow detail Lowest
Texture detail Lowest
Particle detail Lowest
Shader quality Lowest

Steam Launch Options

Next the Steam launch options should be set with settings that'll force the game to run with special settings.
These settings that can't be set within the game.

Option Comment
-refresh 144 Enables 144Hz. Should only be used if a 144Hz monitor is owned.
-malloc=system Windows will handle game's memory allocation.
-USEALLAVAILABLECORES The game will utilize all available cores fromn the CPU.
-sm4 Use DirectX10 instead of DirectX10. Will eliminate minor blur details in the game and give you an advantage and FPS boost.
-maxMem=13000 Maximum allowed allocation of memory (RAM). Allows the game to allocate more memory the higher its set.
Use -lowmemory if your PC has below 8GB of RAM.

NVIDIA Control Panel

There's a couple of quick decision that yields a great FPS boost.
Setting the overall prefence to Performance as done below under "3D Settings -> Adjust image settings with preview".

Check that the 3D settings are set correctly under "3D Settings -> Manage 3D Settings".