function slideNext (speed = this.params.speed, runCallbacks = true, internal) {
  const swiper = this;
  const { params, animating } = swiper;
  if (params.loop) {
    if (animating) return false;
    swiper.loopFix();
    // eslint-disable-next-line
    swiper._clientLeft = swiper.$wrapperEl[0].clientLeft;
    return swiper.slideTo(swiper.activeIndex + params.slidesPerGroup, speed, runCallbacks, internal);
  }
  return swiper.slideTo(swiper.activeIndex + params.slidesPerGroup, speed, runCallbacks, internal);
}