Why is there a huge difference between what the Finder says is available on my internal hard drive and what System Information says is available?

The Finder says I have 123 Gb available on my 500 Gb internal hard drive.
Systen Information says I have 61 Gb of capacity remaining
Tech Tools says I have 61 Gb abailable.
Why the difference?
Since I am experiencing performance problems I tend to believe System Information.
Will optomizing my hard drive with Tech Tools or the equivalent help improve my performance?
At what % of capacity do I need to begin offloading stuff from my hard drive?

At what % of capacity do I need to begin offloading stuff from my hard drive?
According to Apple documentation, you need at least 9 GB of available space on the startup volume (as shown in the Finder Info window) for normal operation. You also need enough space left over to allow for growth of your data. There is little or no performance advantage to having more available space than the minimum Apple recommends. Available storage space that you'll never use is wasted space.

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