How much memory do I need to run SLIM Companion Explorer?

For regular usage 500 MB RAM is sufficient.
On Office 365 (and SharePoint Online) the memory usage is not an issue because Office 365 supports chunked uploads of large files.
It is recommended to have 2 GB free RAM memory when using Chrome / Opera to download & zip large data volumes (e.g. 500 MB).

When uploading large files (e.g. 100 MB's) to SharePoint 2013 it is recommended to have 2 GB free RAM to avoid memory related problems.