On summoner's rift, I bought the Homeguard upgrade for my Ionian boots, just to see if I liked them the most, and when I attacked anything with Vlad's skills, it would reset his movement to 320 for about 5 seconds before returning it to the usual 380 that it should be. I also tested this with the other boots that give extra move speed, but homeguard was the only one that reset his move speed. Not sure if this works with any other champion or not, yet.

Steps:
1. make a custom game on summoner's rift and choose Vladimir.
2. buy homeguard upgrade for cooldown boots.
3. use a skill on an enemy minion, champion, or jungle creep.
4. look at move speed.