HP Laptop works perfectly in Safe Mode but not normally

My HP laptop runs completely smooth and stable when booted into Safe Mode, but during normal Windows startup it suffers from frequent crashes, freezing, and performance lag that make it nearly unusable for basic tasks. This pattern suggests a third-party driver, a startup service, or a recently installed application is causing system instability, rather than a hardware failure, and I need guidance on how to identify the specific culprit through clean boot troubleshooting or driver analysis.