Hi Irwin,
I am really sorry for the delay of this reply as it weekends for all of us here.
What development mode does is easyblog will load all scripts individually which is ideal for debugging process and can also avoid some conflict with other script file that are being loaded on your site. You can change the environment mode from your backend > easyblog > settings > system > system environment.
By the way, does Development mode cause the website to load the blogs much slower. I seem to have this problem now.
Yes it will caused your site to load slower compare to optimized or static mode as all the scripts are being loaded individually instead of compressed script.