Affect performance for searching english language?

Hi, I have installed this module for searching nodes with chinese characters, and understandably search efficiency will be affected. But will it affect the efficiency for searching english words?

Also using the B+ Indexed Dictionary produce the best perfomance, but it combines 2 characters at a go for 3 chinese characters using the cspiltter test page. eg, 回家了

output = 回家 了

I would like to use B+ Indexed Dictionary as its produce the best performace but how can I store all 3 characters at a go instead of 2? Thanks!