<html><head><meta http-equiv="Content-Type" content="text/html charset=windows-1252"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="">Hi,<div class=""><br class=""></div><div class="">I finally took some time to test this further using ITK smoothing filters. Here is an example file that illustrates my problem. Running it in some profiler, it appears that the time is truly lost in allocations and freeing elements (variable length vectors, method AllocateElements and free) when browsing elements in a vector image (while this doesn’t happen for images of itk vectors). Looking into it, there is a part of itk vectorimage I didn’t know about which is the accessor classes and functors. </div><div class=""><br class=""></div><div class="">Would someone have an explanation of the system itself and if it might spend its time creating variable length vectors, or if the problem would come from somewhere else ? Nothing urgent though, I took the second technique in the previous email for my urgent things.</div><div class=""><br class=""></div><div class="">Thanks in advance</div><div class="">Olivier</div><div class=""><br class=""></div><div class=""></div></body></html>