What Simple Changes Made the Biggest Improvements to Your Delphi Programs [closed]

Answer 1

Reduce disk operations. If there's enough memory, load the file entirely to RAM and do all operations in memory.

Answer 2

For an old BDE development when I first started Delphi, I was using lots of TQuery components. Someone told me to use TTable master-detail after I explained him what I was doing, and that made the program run much faster.

Calling DisableControls can omit unnecessary UI updates.

Answer 3

If you have a list, use a dynamic array of anything, even a record as follows:

This needs no classes, no freeing and access to it is very fast. Even if it needs to grow you can do this - see below. Only use TList or TStringList if you need lots of size changing flexibility.

type
  TMyRec = record
    SomeString : string;
    SomeValue : double;
  end;

var
  Data : array of TMyRec;
  I : integer;

..begin
  SetLength( Data, 100 ); // defines the length and CLEARS ALL DATA
  Data[32].SomeString := 'Hello';
  ShowMessage( Data[32] );

  // Grow the list by 1 item.
  I := Length( Data );
  SetLength( Data, I+1 );

..end;

Answer 4

Use the full FastMM and study the documentation and source and see if you can tweak it to your specifications.

Answer 5

If you use threads, set their processor affinity. If you don't use threads yet, consider using them, or look into asynchronous I/O (completion ports) if your application does lots of I/O.

Answer 6

Turn off range and overflow checking after you have tested extensively.