VBA Code slowing down active sheet

Hi Forum.. I have the below codes in one of my sheet in Excel. I have noticed that the scrolling up and down or across the sheet have slowed down. Everytime I click a cell in this sheet, I see excel runs a Calculation in bottom. I have VBA code affecting only till column G but even if I click in a cell in column H or AB, the sheet does performs a calculation. Is this thing normal with a sheet running VBA or I have used a wrong code. I am new to VBA and used code that I found online in different forums suiting my need.

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You may try to switch of event handler for the time of changing values, like:

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Here you change 2 cells values always when you select any cell. So excel always fires Recalculation (probably it is set to automatic)

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