"go build" became very slow after installing a new version of Go

go

Solution

You probably have dependencies that are being recompiled each time. Try `go install -a mypackage` to rebuild all dependencies.

Removing `$GOPATH/pkg` also helps to ensure you don't have old object files around.

Building with the `-x` flag will show you if the toolchain is finding incompatible versions.

Problem

After upgrading from Go 1.2.1 to 1.3 (Windows 7 64 bit) "go build" execution time has increased from around 4 to over 45 seconds. There were no other changes except the go version update. Switching off the virus scanner seems to have no effect. Any clues?

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