I want to flip the pages of a pagelist and maintain their sequence number.

exapmple

.Customer(1)

--> .Name = abc

--> .index = 1

.Customer(2)

--> .Name = xyz

--> .index = 2

should be converted to 

.Customer(1)

--> .Name = xyz

--> .index = 1

.Customer(2)

--> .Name = abc

--> .index = 2

I understand I do sort and manipulate again, also we can loop starting from length and traverse in reverse order.

but is there any other way I can perform this, as this is taking some tim to refresh on UI. my pagelist will generally contain 1000 elements.