Tokushi

Alternate Picking: Practice playing scales, arpeggios, or patterns using alternate picking (down-up-down-up) to build speed and accuracy.

Scales: Work on scales like the minor and major scales, as well as the modes (like the Dorian mode you mentioned) using a metronome to gradually increase speed.

Chromatic Exercises: Play chromatic scales (all 12 notes in a row) using different finger combinations to improve finger independence and speed.

String Skipping: Practice skipping strings while playing scales or patterns to improve accuracy and agility.

Legato Technique: Work on hammer-ons and pull-offs to create smooth, fast lines without relying solely on picking.

Economy Picking: Incorporate economy picking (a mix of alternate picking and sweep picking) for faster, more efficient playing.

Cross-Picking: Practice cross-picking patterns to improve picking across strings.

Sweep Picking: Practice sweep picking arpeggios to improve speed and accuracy when playing arpeggios.

Use a Metronome: Always practice with a metronome to gradually increase speed and maintain accuracy.

Focus on Relaxation: Keep your muscles relaxed while playing fast to avoid tension, which can slow you down.

Start slowly and focus on clean and accurate playing, gradually increasing speed as you become more comfortable. It's also important to warm up properly before practicing to avoid injuries.