Web Report - ABAP Vs JAVA engine - ABAP 10 times faster than JAVA

Guys,
I want to share what we found in our project and see if any of you have insights
into our findings.We are on NW2004S SP14 and we are moving to SP15 in a couple of weeks.We created query, developed WAD for it and executing the WAD takes for this query takes 22 secs (Vs 2 secs using ABAP) the query output has 1 million records and most of the actions we take from that point on like right click on account takes 20 secs (Vs 0 secs/instant using ABAP) , drilldown to level 4 of account hierarchy takes 58 secs (Vs 5 secs using ABAP), drilldown on cost center level 6 takes 42 secs (Vs 4 secs using ABAP), , right click on cost center takes 32 secs (Vs 3 secs using ABAP), ..etc.
Basically every action we take in the JAVA report takes an average of 28 secs.There are 9 aggregates built on the cube that are barely hit by this query but the same query performing same actions with same selections hit the aggregates many many times.The questions I have is why is ABAP so fast compared to JAVA ? What is true explanation behind this behavior ? What are the dis-advantages by using ABAP engine ? Users are loving the performance and features of ABAP while they weren't really on board with the original JAVA report (as it was slow). ABAP is sure enough 10 times faster than JAVA. Query/Query Properties are exactly the same in ABAP and JAVA.Please explain.
Cheers
RT

Hi All,
Thanks to all you for your responses. I appreciate your time for going through my questions and coming forward to express your views.
However, I was looking for more specific "factual" answers. My question is "What does a client miss if they opt to install only ABAP based BI 7.0, as against JAVA Based BI 7.0"
thanks again.
Naga

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