Bruger Excel 2010 virkelig SÅ meget memory?

Både I og K skal være af typen Long
ikke Integer, den går kun til lidt over 30000

du havde nok ikke dimmet dem i den gamle kode.

Data type Storage size Range
Byte 1 byte 0 to 255
Boolean 2 bytes True or False
Integer 2 bytes -32,768 to 32,767
Long
(long integer) 4 bytes -2,147,483,648 to 2,147,483,647
Single
(single-precision floating-point) 4 bytes -3.402823E38 to -1.401298E-45 for negative values; 1.401298E-45 to 3.402823E38 for positive values
Double
(double-precision floating-point) 8 bytes -1.79769313486231E308 to
-4.94065645841247E-324 for negative values; 4.94065645841247E-324 to 1.79769313486232E308 for positive values
Currency
(scaled integer) 8 bytes -922,337,203,685,477.5808 to 922,337,203,685,477.5807
Decimal 14 bytes +/-79,228,162,514,264,337,593,543,950,335 with no decimal point;
+/-7.9228162514264337593543950335 with 28 places to the right of the decimal; smallest non-zero number is
+/-0.0000000000000000000000000001
Date 8 bytes January 1, 100 to December 31, 9999
Object 4 bytes Any Object reference
String
(variable-length) 10 bytes + string length 0 to approximately 2 billion 
String
(fixed-length) Length of string 1 to approximately 65,400
Variant
(with numbers) 16 bytes Any numeric value up to the range of a Double
Variant
(with characters) 22 bytes + string length Same range as for variable-length String
User-defined
(using Type) Number required by elements The range of each element is the same as the range of its data type.

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