Hi Simon,
Thanks for all the helpful comments! I noticed the same problems myself.
1. We didn't enable categories except to admin (in fact I don't have the permissions myself) -- there are probably reasons for this but right now we aren't using categories. Instead, we are using tags to add "version" tags to each post. Later, our developers will convert the tags to actual categories in the SQL.
2,3. I know, it takes so long to load. This and #3 are beyond my control right now though, because they require improvements to the wiki portlet in general and I don't know if anyone can work on those at least in the very present. I will bring those up to the right people and try to get it fixed as soon as possible though. So far I've been just patiently putting in the tags despite the slow speed

You know what I will try my best to get someone to fix it!!!
4. Since deletion can only be done by admins, do me a favor and write "Marked for Deletion - [the resason]" and go ahead and make any changes that you might have done otherwise. You can also tag as "marked for deletion" but tags are slow right now. We will get to it when we start reformatting post contents.
So for your steps
1. Add NEW wiki page with proper title
2. Add content on NEW wiki page
3. Tag and categorize NEW page - in what wiki section your page will be displayed depends on TAGS)
4. Remove tags from OLD page - this way it won't show in wiki sections
5. Remove content from OLD page - google will not show it in its results (and we want that!)
6. On OLD page paste such formula "This page was moved to <new_page_link>" where <new_page_link> is a link to your new wiki page. This way people that bookmarked this page won't be confused about it deletion.
I can do #4-6 by deleting the page. When I delete a page, it automatically does the "This page was moved to <new_page_link>" thing

You and others can help us by doing #1-3. It'd make our jobs even easier if you posted here which ones you want me to delete -- I will do it super fast that way, just for you haha
Thanks so much!! I don't know what we'd do without people to help, the wiki is in need of improvement for sure.
Me and another coworker are currently trying to structure the wiki articles as a tree so that every article is linked to another at least in some way. In doing this we will weed out the bad ones too.

Keep up the great work and help! Thanks Corne also for your help.
Warm regards,
Sam
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