Question on App Process and Java script performance

I have quick question regarding performance of Application process and Javascript.
I'm having OnDemand Application process, which fetches data from db and thru javascript
in page, i'm invoking the application process.
My question is :
If I did not render a page say for 10 mins, and i'm changing field values in my tab report.
Consider i'm having a huge record in my tab report and changing certain updatable column value for all records.
Once i finsished updating the field value (before hitting submit). The same field might have been updated by someother user.
If i render the page, Would it shows data as per current session value or data same as 10 mins before?
Bit confused on this.
Your views on this would be highly appreciated!!
Thanks!
Vijay

... one more reason not to use Tabular Forms.
I'm not sure this is related to performance. I think this is more of a lost update question. If you're using a standard Tabular Form, APEX will check the value of that data in the database to see if it's changed since you opened it. If so, it means someone else edited the data then saved it since you opened the page. APEX will return an error. At that point, the user would have to reload the whole page. If you expect collisions and the fields are big enough that it will take a person a long time to edit, I would strongly suggest NOT using Tabular Forms. If you're only editing one row at a time, the chance of collision between you and another users is substantially less than if you were both editing 15 rows at a time. Also, if there is a collision, you only have to reload one record, not a whole set of them.
Tyler

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