How to increase colormap/linewidth quality in streamplot Matplotlib?

To increase colormap/linewidth quality in streamplot matplotlib, we can take the following steps

Steps

Set the figure size and adjust the padding between and around the subplots.
Create a figure and a set of subplots.
Create x and y data points and then use np.meshgrid() to return the coordinate matrices from the coordinate vectors.
Find X and Y using x and y data points.
Create a streamplot with x, y, X and Y data points. You can increase the linewidth using the linewidth parameter in the method. Here we have used linewidth=5.
Create a colorbar for a ScalarMappable instance, *stream.lines*.
To display the figure, use Show() method.

Example

import numpy as np
from matplotlib import pyplot as plt

plt.rcParams["figure.figsize"] = [7.00, 3.50]
plt.rcParams["figure.autolayout"] = True

fig, ax = plt.subplots()

x, y = np.meshgrid(np.linspace(-5, 5, 20), np.linspace(-5, 5, 20))

X = y
Y = 3 * x - 4 * y

stream = ax.streamplot(x, y, X, Y,  density=1, linewidth=5, cmap='plasma', color=Y)

fig.colorbar(stream.lines, ax=ax)

plt.show()