Brendan Gregg is the Linux performance god. Use the information in this link to find out what ways there are for performacne analysis.
This link is shows the more sophisticated way and encourages to dig deeper for optimizing your system. If you're in a hurry look at Linux Performance Analysis in 60,000 Milliseconds

Rails Long Term Support

Rails LTS provides security patches for old versions of Ruby on Rails (2.3, 3.2, 4.2 and 5.2)

• Prevents you from data breaches and liability risks
• Upgrade at your own pace
• Works with modern Rubies

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