I have multiple environments that'll time out at the step listed below. I uninstalled git 2.0 and installed git 1.9.5. With no changes in the Jenkins job, jenkins worked sucessfully. git.exe -c core.askpass=true fetch --tags --progress
The plugin does not have any different handling of command line git 1.9 and command line git 2.0. Since you changed the command line git versions, I can only assume there is a different in command line git between those versions.
The git plugin is actively tested with automation and with interactive tests for versions ranging from 1.7.1 through 2.8.2. I'm confident this is not a plugin issue.