This benchmark shows the relative speed of a large property array vs field array vs indexer array. The benchmark uses this "timer" macro.

The benchmark has since been updated to include tests of lists as well as rawArrayIndexing.

It now shows there is little difference between accessing array fields or properties or indexed members, but you can get a dramatic speedup if you use the rawArrayIndexing macro. However, rawArrayIndexing does not speed up accessing members of a list because the Boo.Lang.List class normalizes the index value on its own.

[System.Reflection.DefaultMember("h")] class Y: private _size = 10000000 public _a as (int) = array(int, _size) public a as (int): get: return _a h(index as int): get: rawArrayIndexing: return _a[index] set: rawArrayIndexing: _a[index] = value public _l as List x = Y() x._a[0] = 0 print "filling the list, please wait..." x._l = List(x._a) print timer "Overall elapsed time: ": print "First raw array indexing is only used in the class's default member:" timer "Property a: ": i = 1 while i < len(x._a): x.a[i] = x.a[i-1] x.a[i] = x.a[i-1] x.a[i] = x.a[i-1] x.a[i] = x.a[i-1] x.a[i] = x.a[i-1] ++i timer "Array _a: ": i = 1 while i < len(x._a): x._a[i] = x._a[i-1] x._a[i] = x._a[i-1] x._a[i] = x._a[i-1] x._a[i] = x._a[i-1] x._a[i] = x._a[i-1] ++i timer "List _l: ": i = 1 while i < len(x._l): x._l[i] = x._l[i-1] x._l[i] = x._l[i-1] x._l[i] = x._l[i-1] x._l[i] = x._l[i-1] x._l[i] = x._l[i-1] ++i timer "Default member h: ": i = 1 while i < len(x._a): x[i] = x[i-1] x[i] = x[i-1] x[i] = x[i-1] x[i] = x[i-1] x[i] = x[i-1] ++i print print "Now raw array indexing when accessing the class members too:" timer "Property a: ": rawArrayIndexing: i = 1 while i < len(x._a): x.a[i] = x.a[i-1] x.a[i] = x.a[i-1] x.a[i] = x.a[i-1] x.a[i] = x.a[i-1] x.a[i] = x.a[i-1] ++i timer "Array _a: ": rawArrayIndexing: i = 1 while i < len(x._a): x._a[i] = x._a[i-1] x._a[i] = x._a[i-1] x._a[i] = x._a[i-1] x._a[i] = x._a[i-1] x._a[i] = x._a[i-1] ++i timer "List _l: ": rawArrayIndexing: i = 1 while i < len(x._l): x._l[i] = x._l[i-1] x._l[i] = x._l[i-1] x._l[i] = x._l[i-1] x._l[i] = x._l[i-1] x._l[i] = x._l[i-1] ++i timer "Default member h: ": rawArrayIndexing: i = 1 while i < len(x._a): x[i] = x[i-1] x[i] = x[i-1] x[i] = x[i-1] x[i] = x[i-1] x[i] = x[i-1] ++i print

The output I got: (I compiled to exe first and then ran it)

First raw array indexing is only used in the class's default member: Property a: 00:00:02.2187500 Array _a: 00:00:02.2031250 List _l: 00:00:02.4531250 Default member h: 00:00:00.1250000 Now raw array indexing when accessing the class members too: Property a: 00:00:00.1875000 Array _a: 00:00:00.1406250 List _l: 00:00:02.4218750 Default member h: 00:00:00.1250000 Overall elapsed time: 00:00:09.8750000