Solr Query running slow in Prod node

[Dasarathi Minjur]

Hello,
We have a Solr query that runs much slower in Production Solr cluster
compared with lower environments.(Yes they may not be apples to apples
comparison but it's really slow in prod as HDFS gets pounded)
What are the general ways to track/trouble shoot slowness in the query. Is
there any best practices or troubleshoot links. Thanks in advance for your
responses.