When profiling #736 I found that probably we can benefit from caching LastCellUsed value in the same way as we cache cell evaluated value. This function is quite expensive and in some extreme cases may be called for dozens of times during one cell evaluation. So I assume we can save LastCellUsed value and current workbook RecalculationCounter value.

For symmetry, we can also save FirstCellUsed, though I am not sure it will have the same effect.

Since we will cache the value on a worksheet level, this will not affect the memory consumption.