UPDATE
First sorry John if it seems I have hijacked your thread but there is a relevance.
Today, here is what I have done and discovered
1/ As per Frank's suggestion,
I totally disabled my anti-virus/firewall etc disconnected the rubbish WIFI we have here
I then opened the project file which kept slowing down/stalling and was unresponsive.
after only 10 minutes it started again, just like before
2/ I then opened a brand new project file (leaving the first one open)
I then started to replicate the original project file,
5 pages and 4 hours later the new project file was still working pretty good, by the way, I did NOT put any REVEAL MODALS like in the 2 pages in the original project file.
3/ I then opened the original project file (which had been sitting there), and it was still almost totally unusable, although it didn't crash or stick.
after 10 minutes of attempting to edit text/images etc I gave up.
4/ I returned to the second (new) project file and added 1 reveal Modal element, things were still functioning, so I added another, and Loh and behold it started lagging, by this time Site Designer had been in use for at least 6 hours continuous (which for me is like only 1/2 days work when building sites for people.)
I added a further 13 reveal modal components (duplicated the one already there)
suddenly there it was....... it slowed down to almost a standstill.
I then closed both project files and opened Site Designer, this time with the BOOTSTRAP 4 framework, and proceeded to replicate the site,
here we are another 4 hours down the line 5 pages done, NO REVEAL MODAL things because I need to build them separately (not available as a component in bootstrap) the thing is though the project is totally and utterly a joy to work with (except of course it's bootstrap, not my favourite framework) no lagging no delays sweet as a nut.
CONCLUSION
It would therefore appear to me that the foundation framework, has something buggy going on somewhere, It can't be the ANTI VIRUS or Firewall stuff, because it still does it, even when they are disabled
There must also be something to do with the Reveal Modal component from Foundation because the two Foundation framework projects got worse as I added the Reveals.
Tomorrow
I shall make a video or two demonstrating the issues (too tired now)
Food for thought though, I know it's not strictly scientific but it maybe a starter for 10.
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