Recently, many friends have reported that running virtual machines on Mac is particularly laggy, as a veteran who has tinkered from VMware to Parallels and then to UTM, I want to discuss this issue with you today.

Based on our technical team’s experience over the past 3 years helping over 10,000 users solve virtual machine problems, 90% of the lag is caused by improper configuration.

1. Why Do Virtual Machines Lag?

The 3 most common “culprits”:

1. Virtualization engine is not enabled
2. Memory allocation is unreasonable
3. CPU resource limitations

Many people immediately say it’s a software issue, but that’s not the case. Just the other day, I encountered an interesting case where a user complained that Parallels was particularly laggy, and upon investigation, it was found that they had forgotten to enable hardware virtualization…

2. Quick Check in Three Steps

1️⃣ Check Virtualization Support

Open the terminal and enter:

sysctl -a | grep machdep.cpu.features

You must see the VMX option, if not, hurry to enable it in the BIOS!

2️⃣ Reasonable Resource Allocation

🔵 Memory allocation recommendations: – M1/M2 chips: at least 4GB – Intel chips: starting from at least 3GB

Note: The memory left for the host system must not be less than 4GB, otherwise it’s counterproductive.

🔵 CPU allocation: – Do not allocate more than 70% of the physical CPU cores to the virtual machine – Automatically lower priority when running in the background

3. Advanced Optimization Techniques

1. Disable unnecessary effects

In Windows virtual machines: – Turn off transparency effects – Disable animations – Lower the resolution

2. Storage Optimization

For those using solid-state drives: – Enable thin provisioning – Regularly defragment the virtual disk – Clean up snapshots (this takes up a lot of space)

4. Common Problem Troubleshooting

1. Suddenly becomes laggy

   Check if background updates are secretly using resources and close some resource-hungry software

2. Slow to start

   Clean up startup items Compress the virtual disk files

3. Blue screen issues

   99% are driver conflicts, try safe mode

5. Recommended Useful Tools

1. Monitoring tools – iStat Menus: Real-time system load monitoring – Intel Power Gadget: View CPU performance

2. Optimization tools – Clean My Mac: Preferred for cleaning junk – Onyx: System maintenance tool

Tip: These tools all have free alternatives, feel free to ask me in the comments if you need them.

6. Advanced Techniques

For friends doing development, I strongly recommend:

1. Using Docker instead of a full virtual machine
2. Making good use of command-line tools
3. Considering cloud development environments

Don’t limit yourself, there’s a saying in the tech circle: tools are not important, solving problems is what matters.

Finally, here’s a tip for everyone: when virtual machines lag, the first reaction should not be to add more resources, but to check the current resource usage.

If you encounter similar issues, feel free to discuss in the comments. Follow me and reply with [Toolkit] to get the complete optimization guide.

Note: This article applies to Mac devices with M1/M2/Intel chips, and different models may require slight adjustments.

Mac Virtual Machine #Performance Optimization #Programming Tips

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