Don't practice the whole song. Highlight the specific 2-bar run that's tripping you up and loop it until it's effortless.
Guitar Speed Trainer (GST) Pro version 2.3.8.4 is an older but highly specialized freeware software guitar speed trainer pro 2.3.8.4 portable full version
Don't start at your max. Set the trainer to start at 70% of the target tempo. This ensures your technique is "clean" before it gets "fast". Don't practice the whole song
This article dives deep into what this specific software iteration offers, why the "portable full version" is a significant search term among musicians, and how tools like this fit into a modern practice regimen. guitar speed trainer pro 2.3.8.4 portable full version