Generally, there is no size limit for a collaboration and there is also no limit on the number of collaborations. However, the performance will also depend on the hardware you use and on the number of concurrent users on the system. For sure, the less folders and documents are in a collaboration, the better the performance.
The higher the number of folder objects, the longer it will take to open the folder. The problem here is the flat folder structure with the huge amount of data in a single folder. The cFolders design is not intended for such a huge amount of data in single folders. For displaying the overview page the program always needs to check the user's authorization for every object. The rendering of the HTML page itself will get slower with every new entry (i.e. document).
To prevent such performance problems, it is better to use a folder structure with more subfolders, similar to a multilevel BOM, and a lower number of objects (folders, documents) per folder level. According to experience a 5 to 6 level folder structure with 100 to 200 folders per level shows a good performance. But we cannot provide a final recommendation how many objects you can upload in one folder because this depends on many different parameters (i.e. connection speed of end users, connection speed of Backend Server, memory of the Application Server, and so on).
- Periodically review your content server performance and up/down size accordingly
- Utilize the Quick Search(local search) feature as compared to Global Search feature wherever possible