One of the gems on the internet. I first used it with ie4 .... that allowed to be saved locally via ActiveX. Now I have a plugin that saves it to Google drive.
1. I only use it for read only on my phone.
2. Though size can impact load/start up performance, I have found poorly written TW macros and such to cause the biggest performance issues. Large volume of tiddlers can make the problem worse.
I have configured a genealogical solution in TW. So, TW can be used for complex data structures, but you need to be careful on how features are implemented.
Many thanks to people who developed it.