Same! Since the High Sierra update it's been extremely laggy, my fan is going constantly. I can't tell if I'm in game or not because the I can run around and do stuff but apparently I've disconnected. I even did client repair just in case. This is what it spit out when it was done. Mind you, the computer was at the Apple store on the 19th and had the firmware reset and everything put on it correctly there. /BuildRoot/Library/Caches/com.apple.xbs/Sources/AppleFSCompression/AppleFSCompression-96.1.1/Common/ChunkCompression.cpp:50: Error: unsupported compressor 8/BuildRoot/Library/Caches/com.apple.xbs/Sources/AppleFSCompression/AppleFSCompression-96.1.1/Libraries/CompressData/CompressData.c:353: Error: Unknown compression scheme encountered for file '/System/Library/CoreServices/CoreTypes.bundle/Contents/Resources/Exceptions.plist'/BuildRoot/Library/Caches/com.apple.xbs/Sources/AppleFSCompression/AppleFSCompression-96.1.1/Common/ChunkCompression.cpp:50: Error: unsupported compressor 8/BuildRoot/Library/Caches/com.apple.xbs/Sources/AppleFSCompression/AppleFSCompression-96.1.1/Libraries/CompressData/CompressData.c:353: Error: Unknown compression scheme encountered for file '/System/Library/CoreServices/CoreTypes.bundle/Contents/Library/AppExceptions.bundle/Exceptions.plist'[warn] kq_init: detected broken kqueue; not using.: Undefined error: 0[warn] kq_init: detected broken kqueue; not using.: Undefined error: 0[warn] kq_init: detected broken kqueue; not using.: Undefined error: 0[warn] kq_init: detected broken kqueue; not using.: Undefined error: 0Renderer Log: [1168:771:WARNING:resource_bundle.cc(303)] locale_file_path.empty()/BuildRoot/Library/Caches/com.apple.xbs/Sources/AppleFSCompression/AppleFSCompression-96.1.1/Common/ChunkCompression.cpp:50: Error: unsupported compressor 8/BuildRoot/Library/Caches/com.apple.xbs/Sources/AppleFSCompression/AppleFSCompression-96.1.1/Libraries/CompressData/CompressData.c:353: Error: Unknown compression scheme encountered for file '/System/Library/CoreServices/CoreTypes.bundle/Contents/Resources/Exceptions.plist'/BuildRoot/Library/Caches/com.apple.xbs/Sources/AppleFSCompression/AppleFSCompression-96.1.1/Common/ChunkCompression.cpp:50: Error: unsupported compressor 8/BuildRoot/Library/Caches/com.apple.xbs/Sources/AppleFSCompression/AppleFSCompression-96.1.1/Libraries/CompressData/CompressData.c:353: Error: Unknown compression scheme encountered for file '/System/Library/CoreServices/CoreTypes.bundle/Contents/Library/AppExceptions.bundle/Exceptions.plist'[warn] kq_init: detected broken kqueue; not using.: Undefined error: 0[warn] kq_init: detected broken kqueue; not using.: Undefined error: 0[1169:771:WARNING:resource_bundle.cc(303)] locale_file_path.empty()[warn] kq_init: detected broken kqueue; not using.: Undefined error: 0[1170:771:WARNING:resource_bundle.cc(303)] locale_file_path.empty()[warn] kq_init: detected broken kqueue; not using.: Undefined error: 0[1171:771:WARNING:resource_bundle.cc(303)] locale_file_path.empty()[warn] kq_init: detected broken kqueue; not using.: Undefined error: 0[1172:771:WARNING:resource_bundle.cc(303)] locale_file_path.empty()[warn] kq_init: detected broken kqueue; not using.: Undefined error: 0