Create all lines between points A and points B if the distance between them is < 500 meter.

I have two sets of points, A and B. I would like to create lines between them, only if the distance of this line is < 500 meter.

Currently I achieve this using a 1-on-1 join in the FeatureMerger. For each point in A there is a list element with the coordinates stored for point B.

So if I have 300 points of A and 200 of B, I would have a list with 300 features, with each feature having 200 elements.

I then explode the list, and then for each point of B, create the feature, and then check if the distance is <500 meter. This is unfortunately very bad performance-wise, since there are a lot of unneeded connections (> 500m) being made. When running the workspace with big sets of points in A and B this can really effect efficiency.

Is there a way in which I can check the distance between two points before I create the feature?