An interesting post was blogged in the PowerShell Team Blog (https://blogs.msdn.com) and they explained that running the script below you can increase the speed to open your PowerShell Console, as follows:
Set-Alias ngen @(
dir (join-path ${env:\windir} “Microsoft.NET\Framework”) ngen.exe -recurse |
sort -descending lastwritetime
)[0].fullName
[appdomain]::currentdomain.getassemblies() | %{ngen $_.location}
Read more at source: http://blogs.msdn.com/powershell/default.aspx