[Feature Request] Improve SPARQL query performance

**Community Note**
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**Graph Explorer Version (and Graph Database and Version used if applicable)**

**Is your feature request related to a problem? Please describe.**
We have observed SPARQL bug reports related to query execution and performance.

**Describe the solution you'd like**
Review and make improvements to SPARQL query execution and performance.

**Additional context**
Add any other context or screenshots about the feature request here. Describe any alternatives you've considered.