Is it more cost effective to level multiple star at once?

Is it more cost effective to level multiple star at once? - From above of crop banknote of European Union placed on table with dollars

For example: It takes the following amounts of resources to level the characters:

Unlock      100     10
1* to 2*    10K     15
2* to 3*    20K     25
3* to 4*    100K    30
4* to 5*    250K    65
5* to 6*    500K    85
6* to 7*    1M      100

So to level a char from 1* to 7* it would take 1,880,100 credits and 330 shards.

Is it somehow more efficient to level the char from 1* to 7* in one go or will I have to pay for each level subsequently and end with the same amount of shards and credits?






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Is it more cost effective to level multiple star at once? - Universe filled with stars nebula and glowing Milky Way
Is it more cost effective to level multiple star at once? - Decorative star shaped garlands hanging on street at night
Is it more cost effective to level multiple star at once? - Creative star shaped garlands with glowing lamps decorating street against dark night sky






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Images: Karolina Grabowska, Enric Cruz López, Skylar Kang, Skylar Kang