Hi Imran,
Firstly the memory usage report looks alright except for the GLOBAL ALLOCATION LIMIT(110 GB) and the LICENSE USAGE(88 GB)
Looks like you have more memory allocated for your system than the Licensed memory
They should be set to the same number normally, however I do not think that is going to affect your performance
The report also confirms the Columnstore and Rowstore tables along with Heap memory usage is much below the license usage so there does not seem to be any memory pressure here
The slowness is most likely due to the Columnstore tables that are loaded into memory during the first transaction by the Application
You could open a case with SAP support if you think the issue persists and any old transactions start getting slower
Hope it helps
Sunil