Groupshare 2017 too slow

Many of our translators are complaining about the speed of Groupshare 2017.
Here are a couple examples:

1. TM lookup: This can take anywhere from 10 to 30 seconds

2. Checking out files: I timed it on my PC, for a 5MB file, it takes approx. 1 min 30 seconds to check out the file

3. Concordance search: We have to take a coffee break every time we want to search in the TM

* Note that we have many large TMs, i.e. 100,000 to 400,000 segments.

We also have exhausted all other possibilities (hardware, environment, settings) and believe Groupshare 2017 was shipped as a flawed product.
Also, we are not alone, I have talked with other people with the same problems.

Is our only choice to move back to Groupshare 2015? It would be great to hear any other solutions.