Update: On 19-Jan-2016 Oracle released Java 1.8 update 72 which includes fixes to address this issue. Please note that Java 1.8 update 71 (also release on 19-Jan-2016) does not include the fixes needed to address this issue. If you are using IE to run EditLive you should update to Java 1.8 update 72 as soon as you can.
Oracle have acknowledged that there is an issue with Java 1.8 update 60 / 66 and Internet Explorer - the issue causes the JRE to load very slowly (45+ seconds). If you are using Internet Explorer with EditLive you have a couple of choices:
If you wish to keep using Internet Explorer
Downgrade to the prior JRE release. The prior JRE release (Java 1.8 update 51) does not have this issue and is part of the same security baseline. This means that IE will work and you won't be forgoing any security fixes.
If you wish to stay on Java 1.8 update 60 or update 66
Any other supported browser can be used with Java 1.8 update 60 or 66 - this issue is specific to Internet Explorer.
If you have any questions regarding this issue please contact us by opening a support ticket at http://support.ephox.com