> how hard would it be to reduce the time delay between identifying a point and displaying an image
Easy, I expect. I assumed there were two reasons for the delay:
* Simply a transfer delay, though even for images not seen before I'm only seeing between 20ms and 80ms in total for that each time (though it does seem to request each twice).
* Debouncing, to avoid requesting many images needlessly while a user moves the mouse around the page.
* For show, to make it look like it is doing something more clever that requires noticeable processing time!
All but the transfer delay can be removed easily as I think they are put in deliberately, and the transfer+render delay is short enough not matter for what you describe wanting to try.
Easy, I expect. I assumed there were two reasons for the delay:
* Simply a transfer delay, though even for images not seen before I'm only seeing between 20ms and 80ms in total for that each time (though it does seem to request each twice).
* Debouncing, to avoid requesting many images needlessly while a user moves the mouse around the page.
* For show, to make it look like it is doing something more clever that requires noticeable processing time!
All but the transfer delay can be removed easily as I think they are put in deliberately, and the transfer+render delay is short enough not matter for what you describe wanting to try.