Update README #138
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							@@ -289,20 +289,25 @@ see https://github.com/future-architect/vuls/tree/master/setup/docker
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# Performance Considerations
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- on Ubuntu, Debian and CentOS  
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Vuls parses a changelog of upgradable packages. The scan speed is slow and resource usage is heavy when there are many updatable packages on target server.  
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- on Ubuntu and Debian  
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Vuls issues `apt-get changelog` for each upgradable packages and parse the changelog.  
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`apt-get changelog` is slow and resource usage is heavy when there are many updatable packages on target server.  
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- on CentOS  
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Vuls issues `yum update --changelog` to get changelogs of upgradable packages at once and parse the changelog.  
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Scan speed is fast and resource usage is light.  
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- On Amazon, RHEL and FreeBSD  
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High speed scan and resource usage is light because Vuls can get CVE IDs by using package manager(no need to parse a changelog).
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| Distribution|         Scan Speed | Resource Usage On Target Server |
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|:------------|:-------------------|:-------------|
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| Ubuntu      |               Slow | Heavy            |
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| Debian      |               Slow | Heavy            |
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| CentOS      |               Fast | Light            |
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| Amazon      |               Fast | Light            |
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| RHEL        |               Fast | Light            |
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| FreeBSD     |               Fast | Light            |
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| Ubuntu      |               Slow | Heavy            |
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| Debian      |               Slow | Heavy            |
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| CentOS      |               Slow | Heavy            |
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----
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