Usually, no universal slowdown has been established. Microsoft does not publish a general benchmark showing that Edge Enhanced security mode makes ordinary browsing slower. The feature changes how Edge executes code on sites it considers unfamiliar: it disables just-in-time (JIT) JavaScript compilation and enables additional operating-system protections. Those changes can affect particular workloads, especially WebAssembly applications, and Strict mode can cause some websites or web tasks to fail. For most people, Balanced mode is the practical compromise because it protects unfamiliar sites while allowing commonly visited sites to use the normal web platform.
What Edge Enhanced security mode changes
Enhanced security mode is a browser hardening feature. Its goal is to reduce the attack surface presented by web content, particularly code that might exploit the browser or the operating system. Edge does this by disabling JIT JavaScript compilation in the situations covered by the selected mode and turning on additional operating-system protections.
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JIT compilation normally converts JavaScript into optimized machine code while a page is running. Disabling it changes the execution path rather than simply adding a visible security check to every page load. The result depends on what a site does: a mostly static page may show no noticeable difference, while an application that performs heavy calculations in JavaScript or WebAssembly may behave differently.
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Does it slow normal browsing?
There is no official percentage or universal benchmark that can be used to say “Enhanced security makes Edge X% slower.” Microsoft’s consumer documentation does not document a general slowdown for ordinary browsing. Page-load time is also affected by network latency, advertising scripts, server response time, extensions, device performance and the page’s own code, so a change seen on one site cannot be generalized to all browsing.
On a typical news page, documentation page or webmail session, you may not notice a measurable difference. Balanced mode is specifically designed to leave commonly visited sites outside the enhanced-security path. A new site may use the protected execution mode, but the effect is workload-specific, not a blanket reduction in connection speed.
There is a documented performance qualification for developers: Microsoft warns that a WebAssembly interpreter running in enhanced security mode might not deliver the expected performance. WebAssembly is used by some browser-based editors, games, engineering tools, media applications and other compute-heavy software. That warning does not establish that every WebAssembly site will be slow, nor does it show that ordinary JavaScript pages are universally affected. It means that an application relying on WebAssembly should be tested in the mode and on the hardware where it will run.
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| Setting | Protection scope | What to expect |
|---|---|---|
| Balanced | Enhanced protections apply to unfamiliar sites; commonly visited sites are bypassed. | Microsoft recommends this for ordinary use. It aims to add protection on less-familiar sites while preserving normal behavior for sites you use regularly. |
| Strict | Enhanced protections apply to all sites by default. | It offers the broadest default coverage, but Microsoft cautions that users may have challenges completing usual tasks. Exceptions or other configuration may be needed. |
| Per-site exception | A selected site is excluded from enhanced security. | Useful when one trusted site fails while you want to keep enhanced protection elsewhere. |
Balanced mode: the sensible starting point
Balanced mode is the appropriate first choice for most personal systems. Frequently visited sites can continue using the ordinary web platform, while unfamiliar domains receive the additional restrictions. Because the bypass is based on Edge’s familiarity judgment, a site you have only recently started using may initially be treated as unfamiliar.
Balanced is not a promise that every site will work perfectly. A site can still have its own browser, account, network or content-security problems. It simply narrows the circumstances in which enhanced execution restrictions apply.
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Strict mode: stronger default coverage, more troubleshooting
Strict mode applies the protections to every site unless you configure an exception. That makes it the more restrictive choice for people who accept occasional compatibility work in exchange for a broader security boundary. Microsoft explicitly warns that usual tasks may become difficult.
Examples of symptoms can include a web application that does not complete an operation, a tool that behaves incorrectly, or a site feature that relies on a code path affected by the protections. The documentation does not claim that all sites fail, so treat Strict as a setting that increases the chance of site-specific troubleshooting rather than as a mode that makes the web unusable.
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An exception lets you keep the selected mode globally and bypass enhanced security for one site. This is preferable to turning the feature off everywhere when the problem is limited to a single application. Add an exception only for a site you trust and only when the compatibility benefit is worth the change in protection.
What to do when a website does not work
Use the built-in exception workflow before changing other browser settings. The labels below are Microsoft’s documented Edge path; wording can vary slightly with the installed Edge release.
- Open Edge’s menu and select Settings.
- Open Privacy, search, and services.
- Find Enhance your security on the web.
- Select Manage enhanced security for sites.
- Add the affected site’s full URL to the site list.
- Reload the page and repeat the operation that failed.
If the site works after the exception, the result is useful evidence that the enhanced execution mode was involved. If it still fails, remove the exception if it provides no benefit and investigate the site’s account, permissions, extensions, network connection or browser compatibility separately.
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Use the site-level control when available
Microsoft also documents a site-level control in Edge’s Site Trust flyout. When you are on the affected domain, open that flyout and use its enhanced-security setting to change the treatment for that site. The exact control presented can depend on the mode and Edge version, so verify the domain shown before saving a change.
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On a managed computer, an administrator can control trusted or excluded domains with policy. If the exception list is unavailable, keeps reverting, or is disabled, contact the organization’s administrator rather than attempting to work around policy. Administrators can define trusted domains centrally so that a known business application is handled consistently for users.
WebAssembly is the main documented performance and compatibility caveat
WebAssembly (WASM) is a low-level format used to run performance-sensitive code in the browser. Microsoft’s documentation gives two separate warnings that should not be merged into a general claim about Edge speed.
Performance warning for developers
Microsoft says that a WebAssembly interpreter operating in enhanced security mode might not yield the expected performance. This is a qualitative warning, not a published benchmark. It matters most to developers and users of compute-heavy applications, where slower code execution can be visible even when ordinary page navigation feels normal.
32-bit platform limitation
Microsoft’s policy documentation states that WebAssembly sites are unsupported on 32-bit systems when EnhanceSecurityMode is enabled. That is a compatibility limitation for the specified platform context, not evidence that WebAssembly is unsupported on all devices or that all enhanced-security users are affected. If a 32-bit system cannot run a WASM site with the policy enabled, changing unrelated tracking or privacy settings will not remove this documented restriction; the relevant choices are the site’s requirements, the policy configuration and the platform architecture.
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Enhanced security is not tracking prevention
Edge has a separate Tracking prevention feature with its own Basic, Balanced and Strict levels. Do not use the compatibility statements for one feature to explain the other.
Microsoft describes Tracking prevention’s Balanced level as reducing tracking while minimizing compatibility issues. Its Strict level prioritizes maximum privacy and can trade away website compatibility. Those trade-offs concern trackers and related content, whereas Enhanced security mode concerns how web code is executed and which operating-system protections are enabled.
If a page breaks after you change a setting, check which feature you changed. A problem caused by Tracking prevention may require allowing trackers or changing that feature’s level; a problem caused by Enhanced security may require a site exception in the enhanced-security list. Treating them as interchangeable can lead you to weaken the wrong protection.
Platform and Edge policy details
| Policy detail | Documented scope |
|---|---|
| Supported desktop platforms | Microsoft’s policy documentation lists Windows and macOS support beginning with Edge version 98. |
| Mobile support | The same policy documentation says Android and iOS are not supported for this policy. |
| 32-bit WebAssembly | WebAssembly sites are unsupported on 32-bit systems when EnhanceSecurityMode is enabled. |
BasicMode |
Microsoft says BasicMode is deprecated beginning with Edge version 113, treated the same as BalancedMode, and does not work in version 116. |
These are policy and version notes, not a guarantee that every current consumer interface will display the same labels. If your organization manages Edge, the deployed browser version and policy settings determine what is available. On a personal installation, use the current Settings labels and do not assume that an old Basic option represents a separate, less restrictive mode.
How to decide which mode to use
Choose Balanced when you want protection without routine disruption
- You use a mix of familiar services and unknown links.
- You want Microsoft’s recommended ordinary-use configuration.
- You need common websites to retain their normal behavior.
- You are willing to add an exception if one trusted application misbehaves.
Choose Strict when broad default coverage is the priority
- You want enhanced protections applied to every site by default.
- You can test important work applications after changing the setting.
- You accept that usual tasks may require site exceptions or administrative configuration.
Keep an exception narrow
Use the full site URL or domain requested by Edge’s exception control, confirm that it is the legitimate site, and avoid adding broad domains merely to fix an unverified error. A narrowly scoped exception preserves enhanced security for the rest of your browsing.
A practical test for suspected slowdown
- Record the exact site and action that feels slow, such as opening a document, running a calculation or starting a browser-based tool.
- Check whether the site is a WebAssembly-heavy application. The official warning is specifically about WASM performance, so this distinction prevents an overly broad conclusion.
- Note whether you are using Balanced or Strict mode and whether the site is familiar to Edge.
- Temporarily add the trusted site as an enhanced-security exception and repeat the same action.
- Compare the behavior under the same network conditions, browser extensions and account state.
- If the exception changes the result, decide whether the application’s need justifies keeping it excluded. If it does not, investigate non-security causes before changing global settings.
This is a controlled compatibility check, not a benchmark. It can identify a site-specific interaction without implying that Enhanced security has a universal browsing penalty.
Quick Recap
What the evidence supports—and what it does not
- Enhanced security reduces attack surface by disabling JIT JavaScript compilation in its covered sites and enabling additional operating-system protections.
- Microsoft does not publish a general measured slowdown for ordinary browsing.
- WebAssembly may perform below expectations in enhanced mode, according to Microsoft’s developer-facing warning.
- Strict mode has a greater compatibility risk because it covers every site by default.
- Balanced mode is Microsoft’s recommended compromise for ordinary use.
- A site exception and an administrator-managed trusted-domain policy are available troubleshooting routes.
- The separate Tracking prevention feature has different compatibility trade-offs.
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