Excel / VBA性能

Question

I have a certain set of formula in Range("E10001:E20000") which i'd like to copy to Columns("F:CZ") total 1M cells. Options:

1. Range("E10001:E20000").Copy
   Range("F10001:CZ20000").PasteSpecial xlPasteAll
2. Range("F10001:CZ20000").formula = Range("E10001:E20000").formula
3. Range("E10001:CZ20000").fillRight
4. Range("E10001:CZ20000").Select
   followed by Ctrl+R in Excel

At the end, to make the sheet light, i replace formulae with Values, Range("F10001:CZ20000").Value = Range("F10001:CZ20000").Value

What i notice is that Option 4 is way faster than the rest. Can anybody explain the performance penalties in the first 3 options. Note, i'm unfamiliar with time functions and measured physically using seconds clock.

Answer 1

Short answer: Do not use shortcuts with the SendKeys method!
Longer answer: Shortcuts can lead to unexpected results, in my local settings "^r" would (start to) insert a table.
Feel free to use a timer with starttime = Now at the beginning of your code and

timetaken = Now - starttime
MsgBox (Hour(timetaken) & ":" & Minute(timetaken) & ":" & Second(timetaken))

to measure the performance though.
As a rule of thumb, your time is worth way more than system time and corrupting your data by accidentally sending the wrong set of instructions is never worth the risk.
Your operation with 2 × 10,000 cells is not worth optimising.