Are there good reasons to attempt to keep the number of keywords/reserved tokens in a language to a minimum? Such as by repurposing existing keywords for new syntax instead of adding new ones. Ex: Why do some PL choose to have a dedicated keyword for elseif instead of like in C?

I suspect that more keywords may make implementing a compiler more complicated, slower as there are more keywords to compare tokens against or similar. But are these concerns legitimate and are there other advantages to having/maintaining a low number of keywords?