Weird Wifi issue

[jakibaki]

For some reason the Wifi on my MacBook air mid 2012 only has 100kb/s downstream since I upgraded to 10.11. The wifi router sais that my device has a connection with only 1 mbit downstream. If I connect via Ethernet I get full downstream. I already tryed reinstalling and it still does not work

Anyone has an Idea how to fix that?

If it helps here is my wifi.log:

Jun 10 00:30:06 MacBook-Air newsyslog[435]: logfile turned over
Wed Jun 10 05:53:17.339 ***Starting Up***
Wed Jun 10 05:53:17.490 <kernel> Unable to create IO80211InterfaceMonitor
Wed Jun 10 05:53:17.490 <kernel> Unable to create IO80211InterfaceMonitor
Wed Jun 10 05:53:17.716 <airportd[56]> airportdProcessDLILEvent: en0 attached (up)
Wed Jun 10 05:53:52.253 <kernel> wl0: powerChange: *** BONJOUR/MDNS OFFLOADS ARE NOT RUNNING.
Wed Jun 10 06:05:10.394 <kernel> wl0: powerChange: *** BONJOUR/MDNS OFFLOADS ARE NOT RUNNING.
Wed Jun 10 06:10:52.701 ***Starting Up***
Wed Jun 10 06:10:52.884 <kernel> Unable to create IO80211InterfaceMonitor
Wed Jun 10 06:10:52.884 <kernel> Unable to create IO80211InterfaceMonitor
Wed Jun 10 06:10:53.269 <airportd[56]> airportdProcessDLILEvent: en0 attached (up)
Wed Jun 10 06:40:14.140 ***Starting Up***
Wed Jun 10 06:40:14.213 <kernel> Unable to create IO80211InterfaceMonitor
Wed Jun 10 06:40:14.213 <kernel> Unable to create IO80211InterfaceMonitor
Wed Jun 10 06:40:14.213 <airportd[56]> airportdProcessDLILEvent: en0 attached (up)
Wed Jun 10 06:44:33.551 <airportd[56]> _handleLinkEvent: Got an error trying to query WiFi for power. Resetting state variables.
Wed Jun 10 06:48:19.291 <airportd[56]> -[CWXPCConnection performScanWithChannels:ssidList:legacyScanSSID:includeHiddenNetworks:mergeScanResults:maxAge:maxMissCount:maxWakeCount:maxAutoJoinCount:interfaceName:waitForWiFi:waitForBluetooth:tokenriority:reply:]: !!! SCAN request received 0.0164 seconds after previous scan request from 413 (Wireless Diagnostics)
Wed Jun 10 06:49:27.718 AutoJoin: <airportd[56]> AUTO-JOIN triggered (Network Service Changed)
Wed Jun 10 06:49:27.718 AutoJoin: <airportd[56]> user: jakibaki
Wed Jun 10 06:49:27.725 Info: <airportd[56]> PRIORITY LOCK ADDED [client=airportd, type=4, interface=en0, priority=7]
Wed Jun 10 06:49:27.725 AutoJoin: <airportd[56]> AUTO-JOIN STARTED for interface en0 (Network Service Changed)
Wed Jun 10 06:49:27.725 AutoJoin: <airportd[56]> NOT RECOVERY MODE => continuing
Wed Jun 10 06:49:27.725 AutoJoin: <airportd[56]> NOT LOGINWINDOW MODE 802.1X => continuing
Wed Jun 10 06:49:27.725 AutoJoin: <airportd[56]> Reviewing the preferred networks list
Wed Jun 10 06:49:27.725 AutoJoin: <airportd[56]> Adding network ['FRITZ!Box Fon WLAN 7360' (wifi.ssid.<46524954 5a21426f 7820466f 6e20574c 414e2037 333630>) - WPA/WPA2 Personal]
Wed Jun 10 06:49:27.725 AutoJoin: <airportd[56]> NOT LINK DOWN RECOVERY => continuing
Wed Jun 10 06:49:27.725 AutoJoin: <airportd[56]> NOT MAINTENANCE WAKE => continuing
Wed Jun 10 06:49:27.726 AutoJoin: <airportd[56]> No known colocated network for preferred network wifi.ssid.<46524954 5a21426f 7820466f 6e20574c 414e2037 333630>
Wed Jun 10 06:49:27.726 AutoJoin: <airportd[56]> NOT MORE-PREFERRED USER MODE 802.1X NETWORKS => continuing
Wed Jun 10 06:49:27.726 AutoJoin: <airportd[56]> NOT SYSTEM MODE 802.1X => continuing
Wed Jun 10 06:49:27.726 AutoJoin: <airportd[56]> NOT WOW => continuing
Wed Jun 10 06:49:27.726 AutoJoin: <airportd[56]> AUTOJOIN => auto-join using the entire preferred networks list
Wed Jun 10 06:49:27.726 AutoJoin: <airportd[56]> Already associated to 'FRITZ!Box Fon WLAN 7360' (<46524954 5a21426f 7820466f 6e20574c 414e2037 333630>), will not continue auto-join
Wed Jun 10 06:49:27.726 AutoJoin: <airportd[56]> AUTO-JOIN COMPLETED for interface en0, took 0.0042 seconds, returned result 'success', error [NO ERROR]
Wed Jun 10 06:49:27.726 Info: <airportd[56]> PRIORITY LOCK REMOVED [client=airportd, type=4, interface=en0, priority=7]
Wed Jun 10 06:49:28.960 Info: <airportd[56]> GET CURRENT TETHER DEVICE request received from pid 402 (com.apple.preference.network.remoteservice)
Wed Jun 10 06:49:28.962 Info: <airportd[56]> QUERY SCAN CACHE request received from pid 402 (com.apple.preference.network.remoteservice)
Wed Jun 10 06:49:28.966 Info: <airportd[56]> QUERY GAS CACHE request received from pid 402 (com.apple.preference.network.remoteservice)
Wed Jun 10 06:49:28.967 Info: <airportd[56]> GET CURRENT TETHER DEVICE request received from pid 402 (com.apple.preference.network.remoteservice)
Wed Jun 10 06:49:29.755 Driver Event: <airportd[56]> _bsd_80211_event_callback: LINK_QUALITY (en0)
Wed Jun 10 06:49:29.756 Info: <Wi-Fi Menu Extra[279]> link quality changed
Wed Jun 10 06:49:34.758 Driver Event: <airportd[56]> _bsd_80211_event_callback: LINK_QUALITY (en0)
Wed Jun 10 06:49:34.759 Info: <Wi-Fi Menu Extra[279]> link quality changed
Wed Jun 10 06:49:49.776 Driver Event: <airportd[56]> _bsd_80211_event_callback: LINK_QUALITY (en0)
Wed Jun 10 06:49:49.776 Info: <Wi-Fi Menu Extra[279]> link quality changed
Wed Jun 10 06:49:50.375 <airportd[56]> _SC_callback: Changed keys = { 'Setup:/Network/Interface/en0/AirPort' }
Wed Jun 10 06:49:50.375 SC: <airportd[56]> airportdProcessSystemConfigurationEvent: Processing 'Setup:/Network/Interface/en0/AirPort'
Wed Jun 10 06:50:04.527 <airportd[56]> -[CWXPCConnection performScanWithChannels:ssidList:legacyScanSSID:includeHiddenNetworks:mergeScanResults:maxAge:maxMissCount:maxWakeCount:maxAutoJoinCount:interfaceName:waitForWiFi:waitForBluetooth:tokenriority:reply:]: !!! SCAN request received 1.2131 seconds after previous scan request from 413 (Wireless Diagnostics)
Wed Jun 10 06:50:54.426 <kernel> IO80211AssociationJoinSnapshot::captureRequestCallback Problem reported from corecapture