Files or Webservices.. Suggestions on Design Decision.

Hi All,
I'm working on retail company (got around 2000 stores), so 2000 stores will be sending the sales info to PI through webservices (SOAP adapter). Around 70,000 messages will be receiving everyday through webservices. All the messages are processed through Sync/Async bridge (Reponse will be send from PI back to store ).
Day by day, the number of stores are increasing, we are just concern wheather it will be good idea to continue the webservice method or pick the files through file adpter from Stores application server ?
If we go for file adapter.. then it will be asynchronous method. If we stick to webservice, it will be synchoronous method.
I'm not sure will it be any difference in terms of performance from PI perspective if we go through file adapter instead of SOAP ?
Please suggest your thoughts on this? Better to stick to webservice method (Synchrous) or go to file adapter method (Aysnchronous).
Thanks
Deepthi.

Hi Krish,
//// Performance issues might even occur when you start using file adapter
and parallely the customers do grow. ////
Can you please elaborate on this. I thought performance will reduce a lot if I go for Asynchronous FTP than synchronous soap scenario.
I think One more problem we are facing with webservice is, there were lot of logs holding in adapter engine for synchronous calls (Failed and successful calls). So, when java garbage collector runs, it will take lot of time and system will become slow during this time.
The only advantage im seeing with webmethods is a proper handshake will take place with synchronous calls.
Please correct me if i'm wrong.
Thanks
Deepthi

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