After upgrading the app from 2.3.4 to 2.5.4 we noticed that it was slow and almost impossible to work with. A compare of the source code showed that acceleration was turned off in datamodels.conf. Initially I thought the issue was related to queries always using index=*.
To fix this, I just copied the datamodels.conf from the default directory to a new local directory - edit and set acceleration = 1
Maybe the author of the app have some comments to this - why acceleration was removed and the use of index=* ?
If I'd guess on this, it seems like a better practice to deliver a datamodel but with acceleration disabled, because everybody's needs are different. Acceleration can place additional load on a system, and not everybody needs it, so it's better to ship it disabled, and have people enable it if needed. 😉