My fix for low FPS in games. Enable these NVIDIA settings.

• Image Sharpening: Sharpening Off, Scaling Disabled
• Ambient Occlusion: Off
• Anisotropic Filtering: Off
• Antialiasing – FXAA: On
• Antialiasing- Gamma Correction: On
• Antialiasing – Mode: Multisampling
• CUDA – GPUs: All
• DSR – Factors: Off
• Low Latency Mode: Ultra
• Max Frame Rate: Whatever your monitor refresh rate is, I like 60FPS.
• Power Management Mode: Adaptive
• Shader Cache: On
• Texture Filtering Anisotropic Sample Option: On
• Texture Filtering – Negative LOD bias: Allow
• Texture Filtering – Quality: High Performance
• Texture Filtering – Trilinear Optimization: On
• Threaded Optimization: On
• Triple Buffering: On
• Vertical Sync: On
• Virtual Reality Pre-Rendered Frames: 1

I tested these settings on my own Alienware systems. These settings should also work with these GPUs as listed here:
GTX 600 Series through 3000 Series mobile/non mobile
Area-51m i9-9900k/RTX 2080
m17 R1-4, m15 R4
17 R4 i7/GTX 1070
17 R5 i9/GTX 1080
15 R1/R2
X51 R1/R2/R3 GTX 1070, GTX 1660