Expyriment rendering speed

import expyriment
import time

expyriment.control.defaults.initialize_delay = 0
expyriment.control.defaults.open_gl = False

exp = expyriment.design.Experiment()
expyriment.control.initialize(exp)

t1 = time.time()

# Create stimuli
l = []
for i in range(30):
    l.append(expyriment.stimuli.TextLine(text='test'))

t2 = time.time()

# Show stimuli
for i in range(29):
    l[i].present(update=False, clear=False)
l[29].present(update=True, clear=False)
t3 = time.time()

# Print how long it took to create and present the stimuli. The creation time is
# fine, on my system it's about 2 to 3ms. The presentation time depends on whether
# OpenGL is enabled. If not, it's about 43ms, if it is, it's about 135ms.
print 'CREATION TIME = %.2f' % (1000.*(t2-t1))
print 'PRESENTATION TIME = %.2f' % (1000.*(t3-t2))

time.sleep(1)
expyriment.control.end()