Server Object Model is really quite different from Client Object Model. In my opinion, one of the the major difference is "latency".
When migrate the same functionality from SharePoint on-premise Server Object Model to SharePoint Online Client Object Model, it's much slower. However, we can change the "pattern" to make it much faster.
Below is what I do for most of the functionalities in PowerShell. Other languages should be similar.
1. Download relevant data from remote data source (such as SharePoint Online lists) to hash table variables.
2. Process the data.
3. Upload (sync) the changed data back to the remote data source.
For the unchanged data, we can skip them to improve performance.
4. Delete the data from the remote data source as needed.
After migrating a few modules from SOM to COM, I realized that it's not hard at all. The best part: I don't need to worry about "SharePoint memory leaks" any more.
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