User blog comment:NinjaWolfy11/Change in base speed and boots - what it really means/@comment-4022742-20121119105444/@comment-4922088-20121119214903

Depends on the enemy base MS... and I could be wrong about this but I'll give it a try.

Taking in the lvl 6 red buff slow (16%/10%), the enemy has lvl 1 boots, they will be slowed:

350: 294/315

355: 298.2/319.5

360: 302.4/324

365: 306.6/328.5

370: 310.8/333

375: 315/337.5

380: 319.2/342

So basically if you have red buff and are melee you can easily keep up with anyone now without boots, even as Nautilus/Alistar. However, depending on who you are, it will be much easier now to catch them to use your spells to close the initial gap and begin applying the slow.

Even before this anyone with 320ms can keep up thanks to red buff but with your AA taking some time those champions can still fall behind when the person is just a very small amount slower than you. The biggest thing here is not the red buff slow, since they are still the same speed as they are now with boots, but the fact that you can get to them a lot easier when they have boots to begin applying the slow.