How fast is Macbook Air 11 inch wifi?

Hi
I have a Macbook air 11 inch 2015 and Asus ac87u router.
I alway getting 867mbps when i connected to the router, I thought AC could go up to 1gbps+.
How fast can the macbook air go?
Thanks

1Gbps is a theoretical speed - you aren’t going to get that speed and what you are getting is among the fastest I’ve seen. There are several things that bring you below the theoretical speed which includes inference, congestion, how far you are from the router, the number of connections to the router, and network ‘housekeeping’.

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        WebEx64: Version: 1.0 - SDK 10.6 [Click for support]
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        Google Earth Web Plug-in: Version: 7.1 [Click for support]
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        Virtual Keyboard
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        Flash Player  [Click for support]
        GPGPreferences  [Click for support]
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            30%    mds
             6%    WindowServer
             1%    avguard-ondemand-mgmt
             0%    ocspd
             0%    firefox
    Top Processes by Memory: ℹ️
        481 MB    Maps
        447 MB    softwareupdated
        438 MB    firefox
        352 MB    savapi
        172 MB    Safari
    Virtual Memory Information: ℹ️
        824 MB    Free RAM
        4.45 GB    Active RAM
        1.91 GB    Inactive RAM
        1.11 GB    Wired RAM
        12.78 GB    Page-ins
        17 MB    Page-outs
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        Standard users cannot read /Library/Logs/DiagnosticReports.
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