The runtime of z3 is too long

[frankeyjin]

The following code takes almost 10 seconds to run:

from z3 import *

solver = Solver()

a, b, c, d = Ints('a b c d')

solver.add(a == b + c)
solver.add(a * b * c == 90)
solver.add(a * b + c == d)
solver.add(a>=0,a<=99,b>=0,b<=99,c>=0,c<=99,d>=0,d<=99)

if solver.check() == sat:
model = solver.model()
print(model)

But if I remove this line:
solver.add(a>=0,a<=99,b>=0,b<=99,c>=0,c<=99,d>=0,d<=99)
The running time drops to under 1 second.

Why is the time difference so large? I don't understand the reason.