Slower Performance in MSSQL 2014

We upgrade from MSSQL 2008 Standard to MSSQL 2014 to take advantage of the BPE on SSD.  We have the database running on a Virtual Machine in Azure.   For most databases, the performance is great, however for databases with a few large tables the performance is horrible.

Has anyone experienced anything similar?    I've been looking around for solutions and cannot find anything.

The resources on the server seem to be fine....low CPU usage, etc.
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ste5anSenior DeveloperCommented:
Are your tables properly indexed? How large is large? Have checked that you don't have an IO bottleneck?
Éric MoreauSenior .Net ConsultantCommented:
Have you defragged your tables and rebuilt your indexes?
ccleebeltPresidentAuthor Commented:
how do you defrag tables?   I have scripts running to rebuild to recalculate indexes that are fragmented, however the indexes were built in SQL2008.

Understanding that 2012 handles many objects very differently, should I drop and rebuild all?
Vitor MontalvãoMSSQL Senior EngineerCommented:
the indexes were built in SQL2008.
This can be a reason. The algorithm might be changed for 2014 so it's recommended to rebuild all indexes. The larger the table worst will be the performance.
Éric MoreauSenior .Net ConsultantCommented:

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