Instant building costs the same on speedservers even though the building times are 3x shorter. You're much more likely to get instabuild for 1 gold in speed than on normal server, which makes playing it a bit cheaper (not considering travian plus etc).
Do you guys think instant build should be working differently on speed? I mean i love the discount, i just don't think it's fair to get higher buildings built cheaper than on normal servers. Server populations are already lower on normal servers and if i can manage to play speed with less gold spent i need to think twice before playing normal servers.. Please share your opinion on this matter, especially if you disagree with me