adventofcode powershell vs c# timings

day15-part1.ps1

# C# runs in ~0.5 seconds.
# powershell commented out below runs in ~23 seconds.

# correct answer is 567
Add-Type @'
    using System;

    public class MyType1
    {
        public long crunch() { 
        
            long gA = 512;
            long gB = 191;

            long bitmask = 65535;
            long numMatches = 0;

            for (long i=0; i < 40000000; i++)
            {
                gA = (gA * 16807) % 2147483647;
                gB = (gB * 48271) % 2147483647;
    
                if ( (gA & bitmask) == (gB & bitmask) ) { numMatches++; }
            }
            
            return numMatches;
        }
    }
'@ -Language CSharp

$obj1 = New-Object MyType1
$obj1.crunch()

#[uint64]$gA = 512
#[uint64]$gB = 191
#
#[uint16]$bitmask = 65535
#[uint64]$numMatches = 0

#for ([uint64]$i=0; $i -lt 40000000; $i++)
#{
#
#    $gA = ($gA * 16807) % 2147483647
#    $gB = ($gB * 48271) % 2147483647
#    
#    if ( ($gA -band $bitmask) -eq ($gB -band $bitmask) ) { $numMatches++ }
#}
#
#$numMatches
#