Hi @jonathanjone ,
1 - Performance Slowdowns could be because of the warehouse size and the query count, if there are many queries, the warehouse has a limit of 10 query in parallel, else you see the query being queued.
You could also check if the query is optimized or not (kindly see the query profile to get more insights) Also refer to https://community.databricks.com/t5/technical-blog/top-10-query-performance-tuning-tips-for-databric...
2 - Can you please share what warning are you getting on the screen -
The occasional glitches and compatibility warnings within Databricks SQL Analytics
3 - If the network is unstable, you may see issues.
This is the official doc https://docs.databricks.com/en/compute/sql-warehouse/warehouse-behavior.html and the queries are running on the cloud, so the hardware/network you are using should be able to connect you to the Databricks setup, but the jobs/workflows as it is are not going to be impacted by the tablet PC hardware really.
If you can shed some more light on the issue you are facing, can try to help further.
Thanks!