java - Why do multiple RPC calls in GWT significantly slow response time? -

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i'm testing google web toolkit application , having performance issue multiple rpc calls. structure of app is:

  • user submits query
  • initial query serviced single server-side servlet
  • once initial reply received, multiple components subsequently updated iterating on each component , calling update method, passing results of initial query
  • each component's update method work on data passed it, in addition potentially calling other server-side services
  • on success of these calls, component updated in ui.

with initial query service , 1 component (effectively running sequentially), response time fast. however, adding other components (e.g initial query service + 2 components, these 2 components calling asynchronously) hugely impacts response time.

is there way improve / rectify this?

example: (iqs = initial query, c1 = component 1, c2 = component 2, c1s = comp. 1 service, c2s = component 2 service)

initial query + 1 component  iqs, returned - propagating results, 1297273015477 c1, sending server request,1297273015477 c1s, sending back..., 1297273016486 c1, receiving complete, 1297273016522 (total time initial call - 1045ms)  initial query + 2 components  iqs, returned - propagating results, 1297272667185 c1, sending server request,1297272667185 c2, sending server request,1297272668132 c1s, sending back..., 1297272668723  c2s, sending back..., 1297272669371 c1, @ client process, 1297272671077 (total time initial call - 3892ms) c2, @ client process, 1297272674518 (total time initial call - 6386ms)

thanks in advance.

paul

i think need make analysis more fine grained: in data provided have established client started 2nd component call , got response 6386ms later. of was

  1. going on wire
  2. being received @ server
  3. processed @ server (this broken down, well).
  4. sent on wire.

the gwt-rpc service has 1 , 4. know how long each step takes?


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