I have been building a model in the latest neo4j version 4.2.3. Using a simple model to upload a matrix for 13 x 30000 values as row -> column value. Querying this graph was fast in terms of 2-4ms for all values on my laptop. However I wanted to connect this model to a larger existing graph. This graph was made in version 3.5.24. After connecting some nodes and performing the same query as before (totally ignoring the new part of the graph), queries took many times longer. Instead of 2-4ms it was 10-30 minutes for a query.
Does this have to do with the model? or is the neo4j database version to blame?