The problem of using the [number of rows in] block in a loop

My research shows that using the [number of rows in] block in a loop block is much slower when it is not in the loop block.

I think the problem is that, firstly, this block is calculated very slowly and, secondly, it is calculated at each iteration of the loop, which looks quite strange to me personally.

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Yes, I was not mistaken. 100 iterations for the [length of] block run on Android for 0.001 seconds, and for the [number of rows in] block when using Local DB - for 0.49 seconds (500 times slower)!

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Thanks, this is a valuable hint! Maybe the “number of rows” gets recalculated, because when there a items deleted or inserted inside of the loop the number of elements changes?

No, there is no data change in the loop. The blocks for evaluating performance are shown below