Generating threads in for loop - c++

Question

I am trying to separate my collision detection into separate theads to improve the efficiency. The code I have now is:
/*CHECK COLLISION HERE*/
std::thread threads[6];
Vector2 birdPointsArr[6];
Vector2* birdPoints = getBirdPoints(birdPointsArr);
//check each pipe
for (int i = 0; i < 6; i++)
{
//only check pipes with viable x coords
if (pipes[i]->getX() < birdPoints[2].x + 20 && pipes[i]->getX() + pipes[i]->getW() > birdPoints[4].x - 20)
{
//check both upper and lower pipe
for (int j = 0; j < 2; j++)
{
Vector2 pipePointsArr[4];
Vector2* pipePoints = getPipePoints(pipePointsArr, i, j);
//only check pipes with viable y coords
if (j == 0 && birdPoints[0].y > pipePoints[2].y + 20)
{
continue;
}
if (j == 1 && birdPoints[3].y < pipePoints[0].y - 20)
{
continue;
}
threads[i] = std::thread([&]() {
//if x and y coords are viable, check collision
if (collisionDetection(birdPoints, pipePoints)) {
dead = true;
}
});
}
}
}
for (int i = 0; i < 6; i++)
{
if(threads[i].joinable())
threads[i].join();
}
My concern is that I am creating and destroying several threads each frame. I am concerned that all this creation and destruction makes my code slower than if I were to leave it synchronous; however, I don't know how to really measure that. Would it be faster if I just reverted it to serial form?