First, press the green flag. When the variable stops changing, it won’t even have gotten to 50. Now, press the cat. The variable should change extremely quickly. When it stops, the variable will have a value somewhere near the five-hundred to six-hundred thousands (500,000). CONCLUSION: If there is another script going, all scripts will be much slower. How much they slow down depends on how fast the other scripts in the project are completing code. (Lines executed/second)
Although it is obvious that the more code there is, the slower it will be, the amount it slows by is way too much.