In your fourth pregnancy, it's common for contractions to be slower and for labor to take longer compared to previous pregnancies. This is because your body has been through childbirth before, causing muscles and ligaments to stretch more easily. The slow contractions could be due to various factors such as hormonal changes or positioning of the baby. It's important to stay patient and monitor any changes in intensity or frequency of contractions. Active labor typically begins when you're around 4-6cm dilated, but every woman is different. As for pain levels, some women do find subsequent labors easier and less painful due to increased muscle tone and familiarity with the process, but it varies from person to person. Remember that each pregnancy is unique, so it's best to consult with your healthcare provider for personalized advice and guidance throughout this journey.