Fusion 360 freezes on startup and continuously increases memory usage
@altergmai1 - Hello! I was curious to evaluate this in our Product Help MCP and generated some suggestions against our knowledge bases / help etc. Driver looks like the first thing to test, I am curious of this list helps? Please let me know!
-Jamie
This is a well-documented pattern. Your symptoms — memory climbing from ~1.7 GB to 5 GB+ and eventual freeze — point strongly to a graphics driver issue combined with the limitations of integrated graphics. Here's a structured troubleshooting plan.
🎯 Root Cause Analysis
| Factor | Your System | Assessment |
|---|---|---|
| GPU | Intel UHD Graphics 620 (integrated) | ⚠️ Minimum-tier for Fusion — no dedicated VRAM |
| Driver version | 27.20.100.9416 (March 2021) | 🔴 Over 5 years old — this is very likely the primary issue |
| RAM | 16 GB | ⚠️ Meets minimum but leaves no headroom when Fusion leaks memory |
| OS | Windows 11 25H2 | ✅ Supported |
| Fusion version | 2703.1.11.0 | ✅ Current |
🔴 Your graphics driver (March 2021) is the #1 suspect. Fusion 360 interacts heavily with the GPU even on the Home screen, and outdated Intel drivers are a known cause of memory leaks and freezes.
🛠️ Step-by-Step Fix Plan
1️⃣ Update the Intel Graphics Driver (Critical)
Windows Update and Intel Driver & Support Assistant often do not offer the latest driver for OEM laptops like your Toshiba Tecra. You need to get the driver manually:
| Method | Steps |
|---|---|
| Option A: Intel Download Center | Go to intel.com/download-center → search for Intel UHD Graphics 620 → download the latest .exe installer → run it manually |
| Option B: Toshiba/Dynabook support | Go to the Dynabook (Toshiba) support page → search for your Tecra C40-E → download the latest Intel graphics driver they provide |
| Option C: Force install via Device Manager | Download the driver .zip from Intel → open Device Manager → right-click your display adapter → Update driver → Browse my computer → point to the extracted folder |
⚠️ Intel provides generic software and drivers, but your computer manufacturer may have customized these with specific features or modifications. For OEM devices, contacting your manufacturer's support for optimal driver compatibility is recommended.
1
2️⃣ Enable Software Renderer (Immediate Workaround)
If Fusion is responsive enough to reach the menu briefly:
On the Fusion Application Bar, click Help → Support and Diagnostics → Graphics Diagnostic. In the Hardware Information section, review GPU details. Check (Optional) Use Software Renderer (Windows only).
If you can't reach the menu because it freezes too quickly, you can force this via a configuration file:
- Close Fusion completely
- Navigate to
%localappdata%\Autodesk\webdeploy\production\<version>\ - Look for the graphics config or launch Fusion with the command-line flag to disable GPU acceleration
3️⃣ Change the Graphics Driver Mode
Go to the preferences → Go to General → Select the graphics driver option → Test between the available options (DirectX 9, DirectX 11, OpenGL).
Try switching to DirectX 9 — it's less demanding on older Intel integrated GPUs and may prevent the memory leak.
4️⃣ Reduce Graphics Load
Optimize Fusion for performance by setting the Graphics Preset to Performance.
Also:
- Disable Anti Aliasing, Ambient Occlusion, Object Shadow, Ground Shadow, and Ground Reflection in graphics preferences
- Set display scaling to 100% (you've tried this — good)
5️⃣ Clear Cache and Reset Fusion
- Update Autodesk Fusion: How to update Autodesk Fusion
- Clear cache data: How to clear the local user cache in Autodesk Fusion
- Reset Autodesk Fusion: Overview of Reset Autodesk Fusion Command from Fusion Service Utility. Leave the following deselected: "Keep offline user cache".
- Repair Autodesk Fusion: Overview of Repair Autodesk Fusion Command from Fusion Service Utility 3
6️⃣ Check Power Settings
Check the power options in both the control panel and settings to verify that there isn't a low-power, energy-saving, or eco mode turned on. Check the power mode in the control panel first (if the eco mode is selected here it can limit the power options shown in the 'Settings' menu).
On a laptop with Intel integrated graphics, power throttling can compound memory issues.
7️⃣ Disable Add-ins
If there are any add-ins installed, deactivate or update them, and restart Autodesk Fusion.
Even on a fresh install, some default add-ins may auto-load. Disable all non-essential add-ins via Utilities → Add-Ins.
📊 Troubleshooting Priority Order
| Priority | Action | Expected Impact |
|---|---|---|
| 🥇 | Update Intel GPU driver to latest available (2024+) | High — likely resolves the memory leak |
| 🥈 | Switch to DirectX 9 in Fusion preferences | High — reduces GPU memory demands |
| 🥉 | Enable Software Renderer | Medium — bypasses GPU entirely (slower but stable) |
| 4 | Set Graphics Preset → Performance and disable all effects | Medium — reduces rendering overhead |
| 5 | Clear cache + Reset Fusion | Medium — eliminates corrupt local data |
| 6 | Set Power Plan → High Performance | Low-Medium — prevents throttling |
| 7 | Disable all add-ins | Low — eliminates background memory consumers |
⚠️ If Nothing Works — Hardware Limitation
Your Intel UHD 620 shares system RAM for VRAM. When Fusion's rendering pipeline misbehaves with this GPU, it can spiral into consuming all available memory. If updating the driver doesn't resolve it:
| Long-Term Option | Details |
|---|---|
| Use Fusion in a browser | Access fusion.autodesk.com via Chrome/Edge — offloads some rendering to the browser engine |
| External GPU (eGPU) | If your Tecra has Thunderbolt 3, an eGPU enclosure with a discrete NVIDIA card would fully resolve the issue |
| Consider a machine upgrade | A dedicated GPU (even entry-level NVIDIA T-series or GeForce GTX/RTX) would eliminate this class of problem entirely |
📌 Start with the driver update. A March 2021 Intel driver on Windows 11 25H2 is the most likely cause. Intel has released numerous driver updates since then that specifically address memory management and DirectX 11 stability for UHD 620.
Jamie Scherer
Manufacturing Technical Specialist
Fusion 360 Street Team
Nice work getting to that driver. I asked my friend Claude for some advice here if you haven't already. Here's some thoughts to test and single out the cause.
31.0.101.2141 is the final branch Intel shipped for 6th–10th gen, so the graphics stack is now as current as that hardware will ever get. That's a genuinely useful result even though it didn't fix it: you've eliminated the driver, and the failure profile (all user profiles, survives reinstall, persists across two driver generations) now points away from graphics entirely and toward something hooking or starving the main process at the data/identity layer.
What makes me say that: the Home screen is where Fusion gets cloud-chatty — hub/project enumeration, identity token refresh, webdeploy integrity checks. A main process that hangs on first interaction while steadily allocating memory smells like a blocked or endlessly retrying loop, not a rendering fault. And there's a recent, closely matching report: a February 2026 Autodesk forum thread describes Fusion completing login then freezing before a usable UI, where Process Monitor showed AdskIdentityManager.exe repeatedly issuing the same file query against the %LOCALAPPDATA%\Autodesk\webdeploy path with STATUS_BUFFER_OVERFLOW, looping without progressing — surviving clean reinstalls and cache clears, with the behavior consistent unless software rendering was forced. The thread is marked solved but the forum blocked my fetch of the resolution — worth pulling up internally since you'll have better access to the case history than I do. Autodesk Community
Where I'd take the customer next, cheapest discriminators first:
- Different network. Tether to a phone hotspot and launch. If the laptop normally sits behind a corporate proxy or SSL-inspecting firewall, a blocked Autodesk endpoint can produce exactly this retry-loop behavior. Firewall and proxy settings are among the documented causes of Fusion freezing or crashing around startup. Two-minute test, high information value. Autodesk
- Clean boot. msconfig → disable all non-Microsoft services and startup items, reboot, launch Fusion. This rules security/endpoint software in or out — third-party antivirus flagging Fusion is a known cause of freezes on Windows 11, and a Tecra is a business machine that may carry EDR doing per-file scanning of webdeploy's thousands of small files. If clean boot fixes it, add exclusions for
%LOCALAPPDATA%\Autodesk\webdeployand re-enable services in halves to find the culprit. Windows Report - Force software/alternate rendering without reaching Preferences. Since the UI dies on first click, the in-app graphics override isn't reachable, but the graphics mode can be set in
NMachineSpecificOptions.xmlunder%APPDATA%\Autodesk\Neutron Platform\Options. Given the forum reporter's note that software rendering avoided the freeze, this is worth a try as both a workaround and a diagnostic data point — though verify the current XML key against the internal KB since I'm not certain the option names are unchanged in 2703. - Capture evidence while it's hanging. Run Process Monitor filtered to Fusion360.exe and AdskIdentityManager.exe during the hang and look for a tight repeating file or network operation (that's what cracked the forum case). Also grab a dump via Task Manager → right-click Fusion360.exe → Create dump file at ~3GB and again at ~5GB; two dumps let your diagnostics team diff the growing allocations. The logs under
%LOCALAPPDATA%\Autodesk\Autodesk Fusion 360\plus those dumps make a strong escalation package if steps 1–3 come back clean.
My honest ranking: proxy/network first given the fresh-install-on-first-run timing, EDR second. If the hotspot test changes the behavior, you've found your answer and it's a firewall allowlist conversation, not a Fusion bug.
Jamie Scherer
Manufacturing Technical Specialist
Fusion 360 Street Team
