Go-Warp is a simulator based on the Time Warp synchronization algorithm and implemented using the Go programming language. Go is a general purpose programming language announced by Google in the late 2009 and now developed as an Open Source project. The Go language has good support for concurrency and communication; many features introduced in Go seem to have a good potential but its usage in Parallel And Distributed Simulation (PADS) is still not fully explored. We have evaluated the performance of Go-Warp using a synthetic benchmark called PHOLD, that is a model specifically designed for the performance evaluation of Time Warp implementations. Both Go-Warp and the PHOLD model are provided in source code with an open source license