Comments by mehr.ah (Top 9 by date)

You are using the wrong helper name Try replacing the component call with this.
{{> React component=HeaderHelper}}
ref:
https://stackoverflow.com/questions/51233621/react-component-argument-missing-error

I saw above so project did not use cdn but local then :
you said you used ASP. Net Core 2.0 but above layout is a default template for standard .NET web app .
Attention in .NET core you have to know packages and install them from NuGet manually.
so I think you did some think wrong ,
you have to add bundle of scripts in above layout , add references to your jQuery and … after @renderbody().

Take it as a html in pre tag

If your system is slow it is not your fault and you can't do any thing about that but elevate hardware (cpu , ram , vga).some hardware accelerator same as intel humax may help.
I suggest you for current situation you can use your devise (phone) directly instead emulator, it is much more faster that emulator , you need to connect your phone with usp to your pc and sync them together. then android studio use your phone instead emulator.