powerseries creation takes long time.

[Hao Chen]

I was trying to define a power series 1 + O(x^(5e6)) with base ring the finite field with 13 elements. 

And it is taking surprisingly long. 

sage: F = GF(13); R.<x> = F[[]]

sage: prec = 5*10^6

sage: timeit('R([1], prec)') # long time.

5 loops, best of 3: 1.04 s per loop

Could someone kindly point out if I messed up somewhere? Thanks! -- hao

[Travis Scrimshaw]

Hey Hao,
   I cannot reproduce on 7.2.beta5:

sage: F = GF(13); R.<x> = F[[]]
sage: prec = 5*10^6

sage: %time R([1], prec)
CPU times: user 1.62 ms, sys: 326 µs, total: 1.95 ms
Wall time: 1.87 ms
1 + O(x^5000000)

Best,
Travis

[Hao Chen]

Dear Travis, 

Indeed I was using Sage 6.8. I switched to 7.2 and it is okay. Thank you for pointing this out! -- Hao