If the VIR engine is too heavy, try lowering the Oversampling settings in the AmpliTube preferences. Conclusion

Amplitube 5 is the latest version of the popular Amplitube series, a line of software products developed by IK Multimedia that provide a virtual amplifier, effects, and cabinet simulator for guitar, bass, and other instruments. With Amplitube 5, you can create a wide range of tones and sounds, from clean and crunch to overdrive and distortion, using a vast library of models and presets.