I wanted to change the power setting of all my hosts to high performance and not do it one at a time manually.

This is an easy to accomplish this with powerCLI.

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Add-PSSnapin VMWare.VimAutomation.Core

connect-VIServer -server <vcenter.your.domain> -User <DOMAIN\User> -Password <password>

$vmHosts = Get-VMHost
foreach ($vmHost in $vmHosts)
{
$view = (Get-VMHost $vmHost | Get-View)
(Get-View $view.ConfigManager.PowerSystem).ConfigurePowerPolicy(1)
}

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This sets the Power Policy to High Performance (1)

1=HighPerformance

2=Balanced

3=LowPower