VS-2017 Performance / Freeze issue

Hello,

Here are my main problem that I "suffer" from some time now: 

1. Editor take between 5s & 10s for coloring the the code
2. Auto-completion took many time or freeze even for simple things 
3. Closing file make VS. freeze for some seconds, making it non responding (full blank page)

Context:

• Every type of C# (Net 4.6 / 4.7 - Core) solution, big one with ~100 projects (40k LoC)  as 1 project (200 LoC) sln. 
• Working with (basic / medium) LinQ (on container) seem to increase freezing time. 

What I have already done: 

• Followed partially  the `Performance Guide`: 
• > Disable Roslyn full solution analysis
• > Do not track active item in Solution Explorer
• > Do not save autorecover information
• > Do not track changes in text editor
• > Disable automatic formatting by Visual Studio
• > Disable synchronization of settings
• > Do not include Roslyn lightbulb actions into ReSharper's
• Hardware check-list: 
• > Full SSD (VS install + code repo.), I7 6e, 16 Go, Win 10 Pro x64 (stable)
• Followed partially the `Visual Studio preferences`
• Disabled / Uninstalled most of self-installed ext. 
• > [VS] Atomineer Pro + Atomineer Spelling 
• > [RsP] Heap Allocations Viewer
• > [RsP] Cyclomatic Complexity

Environment: 

• VS-2017: 15.8.1 Pro
• Resharper: 18.1.4
• Git + TFS

Any idea how to improve VS/RsP for the two first problems? 
I don't want to lose this features:  Intellisense a-like, git related + ref. CodeLens, RsP fast action (Alt+Inst / Ctrl+Shift+R)

Thanks for help,
Hervé-M