Correct, though increasing the memory allocation isn't always an improvement because it locks the memory into VisualRF only. This is where balancing the memory used by AMP vs VisualRF comes in. If you see that AMP is struggling to make updates, then you may want to reduce VRF memory. The reason being that memory allocated to VRF cannot be borrowed for other processes in the AMP.
Also, the use of the word upgrade should be reserved for versioning changes. In this case, we're saying that the synchronization timer suggests that the VisualRF database is updated every 15 minutes (or sooner depending on work-load). You are on the right track!