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About Us

iPerformance ApS is dedicated to one mission: assisting our customers' operations and development departments with improving performance of applications running on the IBM Power i servers (incl. AS/400, iSeries, and System i).

We developed GiAPA with the sole purpose of identifying and diagnosing performance inefficiencies in jobs running under IBM i, formerly i5/OS or OS/400.

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The founder of iPerformance, Kaare Plesner, has over 35 years of experience as a software engineer. He has worked with the IBM i since it was called System/38 in the 80's.

He has taught more than 200 courses for IBM on OS/400 performance in 21 countries and has been an invited speaker at multiple COMMON conferences in Europe and the United States.

Kaare has assisted companies in 11 countries with optimizing their applications, and has so far never failed to indentify the reason(s) for performance problems for applications running under IBM i.

He is the inventor and key developer of the software product GiAPA. To develop this optimization software he has drawn on his previous experience of pinpointing performance problems within applications.

He can be reached via email at


Corporate Headquarters: Tuborg Havnevej 19, DK-2900 Hellerup, Denmark
Tel.: (+45) 5835 3305

GiAPA accounting dept.: Stakkeledet 46, 2970 Hoersholm, Denmark, Tel.: +45 3698 7200
CVR: 27088724			VAT: DK27088724