After the changes you suggested, the lexicon now appears centered in the popup window which is fine.
After enabling the speed and trying a few searches as you suggested, I find that searches in quotes take much longer (up to 6 seconds for "I say unto you") and the majority of that time is taken by the ’mySQL (fetch verses)’. This varies considerably over a period of minutes so I assume that the server load has a pronounced effect on the fetch function. The database is shared with phpBB2 forums also.
Searches of a particular verse and searches without quotes rarely take more that half a second to fetch.
I did this testing between 5 and 5:30 PM Eastern Daylight Time which tends to be a time of heavy traffic on the server so it doesn’t seem unreasonable to me.