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### Getting the Best Performance from this Library

By far the most important thing you can do when using this library is turn on your compiler's optimisation options. As the following table shows the penalty for using the library in debug mode can be quite large.

Table 47. Performance Comparison of Release and Debug Settings

Function | Microsoft Visual C++ 8.0 Debug Settings: /Od /ZI | Microsoft Visual C++ 8.0 Release settings: /Ox /arch:SSE2
--- | --- | ---
erf | 16.65 (1.028e-006s) | 1.00 (1.483e-007s)
erf_inv | 19.28 (1.215e-006s) | 1.00 (4.888e-007s)
ibeta and ibetac | 8.32 (1.540e-005s) | 1.00 (1.852e-006s)
ibeta_inv and ibetac_inv | 10.25 (7.492e-005s) | 1.00 (7.311e-006s)
ibeta_inva, ibetac_inva, ibeta_invb and ibetac_invb | 8.57 (2.441e-004s) | 1.00 (2.847e-005s)
gamma_p and gamma_q | 10.98 (1.044e-005s) | 1.00 (9.504e-007s)
gamma_p_inv and gamma_q_inv | 10.25 (3.721e-005s) | 1.00 (3.631e-006s)
gamma_p_inva and gamma_q_inva | 11.26 (1.124e-004s) | 1.00 (9.982e-006s)