Restrict CPU core sharing for renderer process
Verified with Microsoft Edge 152.0.4191.53 — updated on July 10, 2026
Supported on: Microsoft Edge version 140, Windows 7 or later
Path in the GPO console
Computer Configuration\Administrative Templates\Microsoft Edge User Configuration\Administrative Templates\Microsoft Edge Description
This policy helps mitigate side-channel cross-process memory attacks by isolating the renderer process to a dedicated CPU core, preventing other processes from being scheduled on the same core. This mitigation is supported on Microsoft® Windows® 11 24H2 and later. If the operating system doesn't support the necessary scheduling features, this policy has no effect. Enabling this policy may reduce performance in demanding workloads, similar to the impact of disabling hyperthreading. For more information, refer https://learn.microsoft.com/windows/win32/api/winnt/ns-winnt-process_mitigation_side_channel_isolation_policy If you enable this policy, other processes can't be scheduled on the same CPU core as a renderer process. If you disable this policy, other processes can be scheduled on the same CPU core as a renderer process. If you don't configure this policy, other processes can be scheduled on the same core as the renderer process. Behavior can vary depending on Microsoft Edge version and platform.
Registry
Software\Policies\Microsoft\Edge Software\Policies\Microsoft\Edge Value name: RestrictCoreSharingOnRenderer
Enabled: RestrictCoreSharingOnRenderer = 1
Disabled: RestrictCoreSharingOnRenderer = 0
Export Builder
BETAConfigure the state, scope and options, then generate .reg, PowerShell, Intune and SCCM outputs — or add the setting to a multi-setting collection.
These exports write the registry — this is not a managed GPO. ⓘ
Applying both scopes creates an ambiguous configuration (computer takes precedence over user). Only do this intentionally.
.reg file
Windows Registry Editor Version 5.00
; Exported from gporais.com
; Policy: Restrict CPU core sharing for renderer process
; State: Enabled
; Scope: Computer (HKLM)
; Supported on: Microsoft Edge version 140, Windows 7 or later
[HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Edge]
"RestrictCoreSharingOnRenderer"=dword:00000001More formats (PowerShell, Intune, SCCM)
PowerShell
# Exported from gporais.com
# Policy: Restrict CPU core sharing for renderer process
# State: Enabled
# Scope: Computer (HKLM)
# Supported on: Microsoft Edge version 140, Windows 7 or later
$path = 'HKLM:\Software\Policies\Microsoft\Edge'
New-Item -Path $path -Force | Out-Null
Set-ItemProperty -Path $path -Name 'RestrictCoreSharingOnRenderer' -Value 1 -Type DWordIntune XML
No direct Policy CSP / OMA-URI mapping for this policy. Use the Intune Remediation tab, or ingest the ADMX in Intune.Intune Remediation
# === Detection script ===
# Exported from gporais.com
# Policy: Restrict CPU core sharing for renderer process
# State: Enabled
# Scope: Computer (HKLM)
# Supported on: Microsoft Edge version 140, Windows 7 or later
function Test-RegistryValue {
param(
[Parameter(Mandatory = $true)][string]$Path,
[Parameter(Mandatory = $true)][string]$Name,
[object]$Expected,
[ValidateSet('String', 'DWord', 'MultiString')][string]$Kind = 'String',
[switch]$Absent
)
try {
$item = Get-ItemProperty -LiteralPath $Path -Name $Name -ErrorAction Stop
} catch {
return $Absent.IsPresent
}
if ($Absent.IsPresent) { return $false }
$actual = $item.$Name
if ($Kind -eq 'DWord') { return ([int64]$actual) -eq ([int64]$Expected) }
if ($Kind -eq 'MultiString') {
$actualValues = @($actual)
$expectedValues = @($Expected)
if ($actualValues.Count -ne $expectedValues.Count) { return $false }
for ($i = 0; $i -lt $expectedValues.Count; $i++) {
if ([string]$actualValues[$i] -ne [string]$expectedValues[$i]) { return $false }
}
return $true
}
return [string]$actual -eq [string]$Expected
}
$checks = @(
(Test-RegistryValue -Path 'HKLM:\Software\Policies\Microsoft\Edge' -Name 'RestrictCoreSharingOnRenderer' -Expected 1 -Kind DWord)
)
if ($checks -notcontains $false) {
Write-Output 'Compliant'
exit 0
}
Write-Output 'Non-compliant'
exit 1
# === Remediation script ===
# Exported from gporais.com
# Policy: Restrict CPU core sharing for renderer process
# State: Enabled
# Scope: Computer (HKLM)
# Supported on: Microsoft Edge version 140, Windows 7 or later
$path = 'HKLM:\Software\Policies\Microsoft\Edge'
New-Item -Path $path -Force | Out-Null
Set-ItemProperty -Path $path -Name 'RestrictCoreSharingOnRenderer' -Value 1 -Type DWordSCCM scripts
# Exported from gporais.com
# Policy: Restrict CPU core sharing for renderer process
# State: Enabled
# Scope: Computer (HKLM)
# Supported on: Microsoft Edge version 140, Windows 7 or later
# SCCM Configuration Item guidance:
# Create a Configuration Item of type "Setting: Script".
# Discovery script: use the Detection script below.
# Remediation script: use the Remediation script below.
# Compliance rule: the Discovery script output equals 'Compliant'.
# === Detection script ===
# Exported from gporais.com
# Policy: Restrict CPU core sharing for renderer process
# State: Enabled
# Scope: Computer (HKLM)
# Supported on: Microsoft Edge version 140, Windows 7 or later
function Test-RegistryValue {
param(
[Parameter(Mandatory = $true)][string]$Path,
[Parameter(Mandatory = $true)][string]$Name,
[object]$Expected,
[ValidateSet('String', 'DWord', 'MultiString')][string]$Kind = 'String',
[switch]$Absent
)
try {
$item = Get-ItemProperty -LiteralPath $Path -Name $Name -ErrorAction Stop
} catch {
return $Absent.IsPresent
}
if ($Absent.IsPresent) { return $false }
$actual = $item.$Name
if ($Kind -eq 'DWord') { return ([int64]$actual) -eq ([int64]$Expected) }
if ($Kind -eq 'MultiString') {
$actualValues = @($actual)
$expectedValues = @($Expected)
if ($actualValues.Count -ne $expectedValues.Count) { return $false }
for ($i = 0; $i -lt $expectedValues.Count; $i++) {
if ([string]$actualValues[$i] -ne [string]$expectedValues[$i]) { return $false }
}
return $true
}
return [string]$actual -eq [string]$Expected
}
$checks = @(
(Test-RegistryValue -Path 'HKLM:\Software\Policies\Microsoft\Edge' -Name 'RestrictCoreSharingOnRenderer' -Expected 1 -Kind DWord)
)
if ($checks -notcontains $false) {
Write-Output 'Compliant'
exit 0
}
Write-Output 'Non-compliant'
exit 1
# === Remediation script ===
# Exported from gporais.com
# Policy: Restrict CPU core sharing for renderer process
# State: Enabled
# Scope: Computer (HKLM)
# Supported on: Microsoft Edge version 140, Windows 7 or later
$path = 'HKLM:\Software\Policies\Microsoft\Edge'
New-Item -Path $path -Force | Out-Null
Set-ItemProperty -Path $path -Name 'RestrictCoreSharingOnRenderer' -Value 1 -Type DWordBuilding a multi-setting collection? Add this setting and generate combined .reg / PowerShell / GPO scripts.