Thanks julianweiland.
I tried your suggestions.
Not too familiar with the .htcaccess, but it looks similar to other sites.
Permalinks is OK.
I reduced the size of the photos, No effect.
Thanks for the link to tools.pingdom.com, this is a useful diagnostic tool.
The site still gets stuck using Safari iOS on iPad and iPhone.
I removed slideshow from this site, just in case they use Flash. Still get the same problem.
Any other ideas would be appreciated.
Problem Site: http://retraiteenaction.ca/blogue/
WordPress 4.2.2, 2015-05-10