Llm-graph-builder local deployment

I have been trying to deploy llm-graph-builder locally for a few weeks. I am able to get it running - upload files and link to Wiki to generate a graph. However, the graph shown does not have entities. I created issues in GitHub, but so far, I am not able to resolve the issue yet. I am using Neo4j Desktop 1.6.1. Database 5.24.0, Plugins: APOC 5.24.2, GDSL 2.12.0. Any help will be very much appreciated.

I insert an api key for diffbot got from Diffbot - Sign In . Entities show up!!. However, it took 5 mins to generate graph for a 75 page PDF documents. Is there anyway to speedup the process?