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Well created Sudoku puzzles are solved by a series of rules/techniques/methods.
At any one time there are one or more rules that can be applied to get another number.
Some times the easiest technique is a simple one such as "where does the 3 go in the top left box?" and there's only one place it can go which is quite easy to spot.
But once these easier items are dealt with you end up with some of the harder rules/techniques/methods such as x-wing, swordfish, singles chains, etc as the only way to make progress. Ref: https://www.sudokuwiki.org/X_Wing_Strategy
Often getting the number from those harder rules/techniques/methods will unlock a bunch of easier to get numbers. Sometimes it just leads to harder and harder rules/techniques/methods needed to get the next number.
So it's not just as simple as it getting progressively easier the more numbers you fill in.
Saying that, once you do get right near the end it's often a case of filling in the last few numbers quite quickly.
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Greenbank
Why does Sudoku not get easier and faster (within one puzzle) as you fill in more numbers? Am I just quite bad at them?
I'd have expected exponential ease and speed, but my progress tends to be jumpy...stoppp...jump jump...stoppp...jump...