Quickly changing Pagefile size?

$init = @{ Query = 'Select * From Win32_PageFileSetting Where Name like "%pagefile.sys"';Property = @{initialsize="900"} }
$max = @{ Query = 'Select * From Win32_PageFileSetting Where Name like "%pagefile.sys"';Property = @{maximumsize="2048"} }
set-ciminstance @init
set-ciminstance @max

@Echo Off & Cls

net sess>nul 2>&1||(powershell start cmd -ArgumentList """/c %~0""" -verb Runas & exit)

:: Set virtual memory size to static amount.
SETLOCAL ENABLEDELAYEDEXPANSION
For /f "tokens=4,5* delims=,. " %%G in ('Systeminfo  ^| Find "Total Physical Memory:"') DO Set RAM=%%G%%H
If "!RAM!"=="" Goto :EOF
set /a "pageSize=ram + ram / 2"
Reg add "HKLM\SYSTEM\CurrentControlSet\Control\SESSION MANAGER\MEMORY MANAGEMENT" /v "PagingFiles" /t REG_MULTI_SZ /d "c:\pagefile.sys !PageSize! !PageSize!"  /f
ENDLOCAL



Cls & Mode CON  LINES=11 COLS=51 & Color 0E & Title FreeBooter
Echo.
Echo.
Echo THIS COMPUTER WILL REBOOT
Echo.
Echo.
Echo PLEASE SAVE ALL WORK IN PROGRESS
Echo.
Echo.
Echo PRESS 'ENTER' KEY TO REBOOT PC

Pause >Nul

Shutdown  -r  -t 5  -c "REBOOTING SYSTEM"