Long delays in loading Webmail sign-on block

Since the server moved, long delays (a minute or more) are occurring when trying to access Webmail.  This causes many web browsers to time out and stop trying, thus denying service.  Used to work very well on iPad web browsers.  Now times out.  Firefox seems to work most of the time, but Internet Explorer is hit-or-miss.  Also long time delays after signing on before mail appears (but this does not time out).