Hi all! I'm really looking for some help with a frustrating issue I'm experiencing with slow launch times for my EC2 instances. I'm using new AMIs based on Windows 2022 and 2025 along with the recommended Launch Template v2 configuration, and I've noticed that the initial launch time is around 9 to 10 minutes. This is significantly longer than the quick launches I had with my old AMIs from 2016 and 2019, which used a different configuration. Once the instances are up and running, subsequent reboots are fast, but that long wait time during the initial setup is a huge bottleneck for my Auto Scaling Group (ASG).
I've tested both my custom AMIs and some standard Amazon-provided ones, and they all show the same delays. I prepared the AMIs correctly using Sysprep and ensured there are no heavy tasks during instance creation—no user data scripts, heavy software installs, just the default AWS drivers. AWS Support has confirmed they see similar slow behavior in their tests.
I'm left wondering if anyone else has faced this odd delay when transitioning to the newer AMIs and Launch Template v2? If you have any insights or suggestions for optimizing the initial setup time, I would really appreciate it!
3 Answers
It's possible that the issue might relate more to the Windows version than the launch templates you're using. You might want to test using Windows 2022 and 2025 with the older Launch Configuration. Also, the size of your base image could affect launch times. Have you looked into AWS's fast launch feature? It was introduced with the newer AMIs and could help reduce those long initialization times. Here’s a link to check out: [Fast Launch Documentation](https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/win-ami-config-fast-launch.html).
Just a side note: consulting tools like Copilot or Gemini can sometimes end up being a bit vague, so digging into specific settings may yield better results.
The 9-10 minute wait is usually tied to Windows setup processes and EBS cold starts, not necessarily the launch template. Here are some quick suggestions:
- Try using instance types other than T-series for faster launches; consider M or C series instead.
- Put your root volume on gp3 with higher IOPS and enable Fast Snapshot Restore for AMI snapshots.
- Pre-bake your updates and ensure any cleaning processes are finalized before sysprep. Also, check that there isn’t a WSUS or domain policy affecting your setup.
- Lastly, consider an ASG warm pool to hide initial launch delays and signal readiness via WinRM or SSM, which can simplify checks.
Just a heads up, the terminology can be a bit confusing! You mentioned Launch Configurations (which are the older, deprecated setups) and Launch Templates (the newer method you're using).
Also, have you checked what instance types you're launching? Some can indeed take longer during initial setup. Also, how are you measuring the launch time? Are you tracking from the moment it starts launching to when it's ready for use? User data scripts can add time as well, so that's worth considering too.
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