template caching and tag caching work fine. The plug-in will obey boath, actually that is EE it just does not process the plug-in again if eather are cached untill the cache expires.
justurl still does the same thing but it just returns the url/path to the image rather than all the other img code
the caching works like this:
is there a cached version for the size? (simple php file exists check)
yes
is cached version newer than original (simple file time comaprison)
yes
return url
so if eather of thoes above were no then it would make a resized cached version of the image
so really the php overhead is very very low unless resizing is needed but the resizing is really lightweight as well
also i have not looked at phpThumb but allot of applications like this actually return the cached file as a data-stream setting its own header as a image type and returning itself as the image. meaning the aplication would have to stream the entire image through itself each time it is loaded, rather than just returning itself as a file path.
