Board Thread:Community Discusson/@comment-28117441-20160610044819/@comment-5175866-20160610140108

As always the best place to check for dead link pages would be Special:WantedPages (I would usually have to reccomend Special:Insights/wantedpages, but it does not match with the SpecialPage for quite some time) to see what are the most Redlinked pages. 
There shouldn't be any reason why the Save page button was not working. Based on your description I assuming it was grayed out? If this is the case copy the work you have made (if there are things like refs or other things only copyable in source editor, copy everything without source incase the editor would crash) and then reload the page. Paste the material back in and make any cleanup you need from the copy-paste. After this you might need to hit the spacebar or enter button to get the Save Page button to appear. 
This is likely an Internet issue (even I myself experience loading issues with the Editor, but I do not have a horrid internet connection). Perhaps try restarting your modem if the Internet continues to run slow, and if still does, consider upgrading your Internet speed, or have your ISP send someone to investigate the issue.