How to efficiently map data between time series in python

I'm trying to create an efficient function for re-sampling timeseries data.

Assumption: Both sets of timeseries data have the same start and end time. (I do this in a separate step.)

Resample function (ineffecient)

import numpy as np

def resample(desired_time_sequence, data_sequence):
    downsampling_indices = np.linspace(0, len(data_sequence)-1, len(desired_sequence)).round().astype(int)
    downsampled_array = [data_sequence[ind] for ind in downsampling_indices] 
    return  downsampled_array

Speed testing

import testit
def test_speed(): resample([1,2,3], [.5,1,1.5,2,2.5,3,3.5,4,4.5,5,5.5,6])
print(tesit.testit(test_speed, number=100000)
# 1.5003695999998854 

Interested to hear any suggestions