Queued line draw are significantly slower in Firefox (Gecko)

[coreyshuman]

Queued line draw performance in Gecko:
FPS: 7

Non-queued line draw performance in Gecko:
FPS: 62

Comparison: queued line draw performance in Chrome (V8):
FPS: 237

Comparison: non-queued line draw performance in Chrome (V8):
FPS: 150

Code

Most time appears to be spent in the 'moveTo()' function call here:

Constellation/constellation.js

Line 685 in 2a096a0

ctx.moveTo(line.x1, line.y1);

Possible solutions

• Select queue or non-queued based on browser (accurate browser detection becomes a maintenance issue)
• Troubleshoot/research moveTo() performance in Gecko and work on alternative implementation or submit fix upstream.