selenium - Demandware site testing -

we using demandware our ecommerce site giving sandboxes development , testing.

i automating site regression testing. if run automation scripts on testing sandbox, taking longer time load page result test fails.

so best way automation testing on demandware related websites ?

is possible deploy site cloud ?

is possible increase performance of testing related sandbox ? tests not fail?

can please suggest thoughts?

use development instance these tests, close production in terms uses akamai cdn, loading of pages relatively faster. if sandboxes/development instances performing slow, may idea in pipeline profiler in demandware business manager insight performance bottleneck lying.