RPCS3 is extremely CPU-heavy. Even with the best firmware, a weak processor will result in stuttering.
Downloading firmware from unofficial sources is often a violation of TOS and copyright laws. How to Get High-Quality PS3 Firmware Safely ps3 bios for rpcs3 39link39 high quality
If you have installed the firmware but games are still not booting, check the following: RPCS3 is extremely CPU-heavy
The most common misconception for new users is that they need a "BIOS" file similar to those used in PlayStation 2 or PS1 emulators. For the PS3, RPCS3 actually requires the Official PlayStation 3 System Software, also known as the firmware. How to Get High-Quality PS3 Firmware Safely If
By using the official file, you ensure that the emulator has the most compatible version of the software, which is essential for "Playable" status in high-end titles. Optimizing RPCS3 for High-Quality Gameplay
By avoiding suspicious "39link39" style shortcuts and sticking to the official Sony firmware, you ensure your emulation journey is safe, stable, and truly high quality.
Ensure your firmware version matches or exceeds the requirements of the game you are trying to play.