This article explains how to troubleshoot common issues with CertMaster videos, including performance problems, internet speed limitations, and computer‑related playback issues.
1. Quick Troubleshooting Ideas
- Restart your computer.
- Reset your router.
- Make sure you have an internet speed of at least 3.6 Mbps per user. This is generally the single most important factor in having a smooth experience while viewing our videos. (Test your speed at Fast.com.)
- Try the videos in a different browser, because browsers can perform very differently.
2. How CertMaster Videos Work
The videos are, by default, 720p quality .mp4 files with an H.264 encoding that are streamed as HTML5 video and played by your internet browser. A typical video can be 20 MB – 80 MB in size. Some of our videos support mono and stereo audio only, so custom audio managers and speaker setups should ensure that they are not using surround sound in order to hear the audio.
We use a content delivery network (CDN) to deliver our content anywhere in the world with speed and efficiency. Due to the way it is set up, it is uncommon for any slowness to be caused by too much demand on the servers.
3. How to Find Your Internet Speed
We officially require at least 3.6 Mbps internet download speed, but we have found that most videos stream fine at 3 Mbps. At around 2.5 Mbps some momentary buffering may be noticed. Approaching 2 Mbps or less, stopping, stalling, and buffering can be a frequent occurrence.
To check internet speeds, we recommend freshly restarting the computer, resetting your router, and turning off any other devices that use your internet connection to reduce the possibility of interfering factors. Then navigate to https://fast.com (chosen for its simplicity and acceptable accuracy).
Fast.com will automatically begin to run its test and tell you your download speed. If you suspect the result you see is inaccurate, reload the test once or twice. If you see Kbps instead of Mbps then your internet speed is inadequate. 1000 Kbps = 1 Mbps.
4. Troubleshooting Internet Speed‑Related Issues
If you find that your internet speed is below our minimum requirements, here are some ideas on what you can do about it:
a. Contact your internet service provider (ISP) and ask what speed you are paying for. If you are paying for speeds that exceed 3.6 Mbps, but your results indicate that you are receiving considerably less than that, then you should ask your ISP to help you troubleshoot the issue further.
b. If you are paying for an internet speed that is slower than 3.6 Mbps, then consider upgrading your Internet plan or using a faster internet connection at another location, such as at a public hotspot, your school, or the public library.
c. Do what you can on your end. Limit the number of devices that are connected to the internet, try connecting your computer directly to the router with an Ethernet cord, or test on another computer and/or internet connection.
5. Troubleshooting Computer‑Related Video Issues
If you still can’t play the videos without them stuttering, stopping, or buffering, even after ensuring that your internet speed is adequate, then the problem may be on your computer’s end. Your computer needs to be able to receive the video from the internet through its network card, interpret and open it with browser and CPU, and play and display it with the video card/chip and monitor. Many things could interfere.
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Ensure that your network and display adapters have updated drivers.
In Windows, open the Device Manager and expand the network and display adapters sections, right‑click on the adapter and click Update Driver.
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Try toggling on or off your browser's hardware acceleration setting.
Having it set to On is the typical default, but we have seen strange video problems be solved by toggling the setting. In Google Chrome, this can be toggled by going to
chrome://settings/, clicking “Advanced” at the bottom of the page, then scrolling down to the “System” area and switching the “Use hardware acceleration when available” setting on or off. -
Close any programs that don’t need to be running.
Some programs and browser extensions, add‑ons, toolbars, or plugins can slow you down and eat up your computer’s resources. Others automatically start in the background when you start your computer. Turning off programs that don’t need to start with your computer or browser will free up the computer’s resources to focus on CertMaster.
Disable unneeded start‑up programs
Helpful article: https://www.howtogeek.com/173347/beginner‑geek‑everything‑you‑need‑to‑know‑about‑disabling‑startup‑programs‑on‑windows/Disable unneeded browser extensions, add‑ons, toolbars, or plugins
Helpful article: https://community.box.com/t5/How‑to‑Guides‑for‑Account/How‑To‑Disable‑Plugins‑Add‑Ons‑Extensions‑In‑Multiple‑Browsers/ta‑p/19 -
Check for malware.
Malware can affect your experience with our software. Look through your list of programs and browser extensions for toolbars or items you didn’t intentionally install. If you notice anything out of place, consider removing it and running a malware scan and cleanup. We recommend the free version of MalwareBytes to help find and remove malicious programs on your computer (https://www.malwarebytes.com/mwb-download/).
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Check antivirus, security software, or firewalls.
Sometimes third‑party antivirus, security software, or firewalls can interfere. They can slow everything down, block certain items from displaying or opening in our program, or even cause the program to crash. Experiment by temporarily disabling these services to see if they might be the cause of your issues in CertMaster courseware. If performance improves, consider switching to a different program, or uninstalling that program and using your computer’s default antivirus and firewall software.
One program to note is Kaspersky. Kaspersky has a setting that is incompatible with our software. This setting injects its script into our script, causing hundreds of consecutive errors until the browser crashes or freezes. Disable this setting: Kaspersky Settings → Additional → Network → Traffic Processing: Inject script into web traffic to interact with web pages.
6. Other Troubleshooting Ideas
- If you are on a laptop, plug it in. Laptops may not focus on performance if they are set to conserve battery life.
- Try using only one monitor. Your video adapter/card has to put every pixel on your screen as fast as it can. More monitors mean more work; if things still aren’t working normally after trying everything else, test with a single monitor.
- Along the same principles as above, reducing the size of the video on the screen can reduce the strain on your computer and may help the video play smoothly. Try viewing the video outside of full screen and in a smaller window.
- Try viewing the video at 1x speed. Browsers can play the video up to twice as fast as normal. If you notice stuttering and pausing at higher speeds, slow it back to the default speed to see if performance improves.
- If performance only recently got worse, consider undoing recent changes that might have been made on the computer. Uninstalling updates, uninstalling software applications (Programs and Features), and restoring your computer to an earlier point (Windows Recovery) are examples of undoing changes that may have caused performance loss.