Stuttering with Interpolation (Sprites + Views)

[Rutin]

I'm having a problem with stutters during interpolation. Depending on what I'm doing it can happen every 10+ seconds, other times it will happen every few seconds, or more frequent.

I noticed when I use a view and move it the same thing will happen but more often.

In my sample code I have one sprite and background with interpolation, but the stutter will happen.

Now I'm wondering if this is an error in my code which I don't see, or is SFML clock causing an issue between frames which is causing a hiccup? It's not as noticeable with just a tiny sprite, but when you're drawing tiles and using a view for a camera the hiccup is every few seconds.

At the start of my Logic for Input I set the Prev Pos to the Current, then once in the Draw part I interpolate like so:

interpolation = float(mainClock.getElapsedTime().asMilliseconds() + skipTicks - nextTick) / float(skipTicks);

                        mySpritePositionDraw = mySpritePositionPrior + (interpolation * (mySpritePosition - mySpritePositionPrior));
                        mySprite.setPosition(sf::Vector2f(mySpritePositionDraw));
                        mainWindow.draw(mySprite);
 

Problem Fixed - was Joystick polling from SFML 2.4.2

[Rutin]

I just did an update from SFML 2.4.2 to SFML 2.5.0 and the problem appears to be gone.... I looked more into this and I found that other people had this same issue due to joystick polling.

I noticed on the 2.5.0 change log:

[Windows] Replaced time-based joystick poll with a hardware event handler

This must've been my issue.