Slow and/or unresponsive videos

Hi!  My students are having a hard time with the tutorial videos found in this link:   They are finding them slow to access and often getting part way through the tutorial and then the system is not responding.  Is there a problem with these videos?   Is there are recommended browser I should recommend.  I agree that the system does seem slower and unresponsive even when I tried to login.   Please help!

 

Prof. RV