Question FPS Drop aggressively in Games

[Aizen2k25]

I'm experiencing severe FPS drops. It's not a smooth dip from 60 to 58, but a sudden freeze that lasts for a microsecond. This wasn’t a problem before when I was using integrated graphics and an older motherboard. After numerous tests, I’ll list everything I’ve tried below. Please take a look—I’ve covered even the obvious solutions.

My setup:
CPU: Ryzen 5 4600G
GPU: RX 6600 Asrock Challenger
Motherboard: MSI B450M Pro VDH Max
RAM: 2x8GB T-Force 3000MHz
PSU: Corsair CV650
SSD: Crucial BX500 (System + MC 1.8.9)
NVMe SSD: Lexar MN620 512GB M.2 (Games)
Monitor: LG Ultragear 144Hz FreeSync

Interestingly, not all games are affected. I had no issues with JC3 and TW3, but others like L4D2, GTA V/Online, and MC 1.8.9 show FPS drops.

In MC 1.8.9, opening the inventory causes an immediate drop of about 10 FPS (e.g., from 144 to 134), sometimes more, sometimes less. Other actions, like hitting a mob or entering water, also cause noticeable drops, which really ruins my experience, especially since the game is over 10 years old and should run fine.

GTA V has random FPS drops, especially during cutscenes. There are also stutters in some areas, even on low settings.

L4D2 freezes randomly, especially during the first few minutes of gameplay.

I’ve tried a lot of solutions, so here's a list of everything I’ve done:

• Swapped PSU with a friend's working one
• Tested each RAM stick individually
• Ran MemTest (no errors)
• Enabled/Disabled XMP
• Disabled Dual Channel
• Lowered RAM clock to JEDEC standard and tested below 3000MHz
• Reverted to my old motherboard + fresh Windows install
• Bought a new mouse and lowered DPI
• Undervolted CPU
• Enabled/Disabled PBO
• Enabled/Disabled fTPM
• Enabled/Disabled Virtualization
• Temperatures for both CPU and GPU are below 70°C
• Disabled integrated GPU
• Fresh Windows install without RX 6600
• Swapped RX 6600 with GTX 1050 Ti (used DDU)
• Undervolted RX 6600
• Tried multiple driver versions for RX 6600 (using DDU)
• Enabled/Disabled FreeSync
• Enabled/Disabled 4G Decoding & Resizable BAR + SAM
• Installed only GPU drivers without Adrenalin Software
• “Optimized” Windows settings
• Switched to Windows 11
• Installed Windows on another SSD and NVMe M.2
• Enabled/Disabled HPET
• Enabled/Disabled MPO
• Enabled/Disabled Core Isolation in Windows 11
• Disabled Windows Firewall
• Disabled overlays (Discord, Adrenalin, Steam)
• Disabled Steam Cloud
• Limited FPS to 60/70/144
• Increased pagefile size
• Updated/downgraded BIOS
• Ran GPU stress tests
• Reduced latency using LatencyMon
• Lowered in-game graphics settings
• Enabled/Disabled V-Sync / Enhanced Sync
• Disabled unnecessary background programs
• Disabled non-essential Microsoft services
• Enabled/Disabled Memory Tick
• Ran games in windowed mode
• Checked for high RAM/Disk usage
• Monitored background processes (only essential ones running)
• Updated chipset, audio, and network drivers
• Enabled High Performance and Ryzen High Performance power modes
• Disabled PCI Express power saving mode
• Disabled HDD sleep mode in power settings

MC-specific:

• Tried newer MC versions (same issue)
• Tested different Java versions

Honestly, I don’t know what else to try. I’m exhausted and frustrated. I didn’t have these issues before, even with integrated graphics. While not all games are affected, the fact that MC shows this problem proves something isn’t right.

I’ve practically rebuilt my PC and still deal with more issues than enjoyment. If anyone has experienced this before or has any other suggestions, please let me know. Every failed attempt just makes me more frustrated

 

[helpstar]

check your internet connection and router
are you connected to wifi or ethernet cable?
check if the network connection in windows is set to private or public, Private would be correct

check the CPU temp. with a stresstest, check the frequency while freezing of CPU and GPU

which other PSU did you try?
which BIOS versions did you try? beta as well?

it seems your CPU is faulty or works not like before

 

[Aizen2k25]

I remember playing without internet, and there were still stuttering issues. It's hard to say it's the CPU, since it works well in other games. It seems to be some configuration in Windows, I'm almost switching to Linux just to see how it works.

I’ve tested with another PSU, a Gamemax 650W Gold, which was originally mine, and I lent it to my friend. He gave me his Corsair CV650, and it works fine for him, but nothing changed for me.

Yes, i tried other BIOS versions.