There are several problems which your code the first is that you are loading shapes and processing the csv file in draw(). The draw method is executed repeatedly (about 60 times a second) it should really be only used to draw the shapes all the other processing should be done in setup() which is executed once when the sketch first runs.

The second thing is processing the csv file, you have code that counts the number of items in each line and then create a 2D array using the largest value. Since your data is structured all the lines in the csv file should have the same number of items if they didn't there would not be possible to process the data since you wouldn't know which items are missing or added.

Even if we assume that the lines have differing numbers of items Java can help us out since a 2D array is in fact a 1D array of 1D arrays. This can simplify the programming dramatically.

I have modified your code taking these things into account.

Also I have introduced 2 new variables count and rowLength, a new row is created every "maxLength" shapes have been drawn - try different values for rowLength and see what happens.

1. PShape s1,s2,s3,s4;
2. PShape s5,s6,s7,s8;
3. String [][] csv;
4. int count = 0;
5. int rowLength = 50;
6. void setup() {
7.   size(1600, 800);
8.   noStroke();
9.   smooth();
10.   s1 = loadShape("Form/electro.svg");
11.   s2 = loadShape("Form/rock.svg");
12.   s3 = loadShape("Form/alternativ.svg");
13.   s4 = loadShape("Form/hiphop.svg");
14.   s5 = loadShape("Form/soundtrack.svg");
15.   s6 = loadShape("Form/live.svg");
16.   s7 = loadShape("Form/jazz.svg");
17.   s8 = loadShape("Form/pop.svg");
18.   String lines[] = loadStrings("Test.csv");
19.   csv = new String[lines.length][];
20.   for (int i=0; i < csv.length; i++) {
21.     csv[i] = split(lines[i], ',');
22.   }
23. }
24. void draw() {
25.   background(200);
26.   count = 0;
27.   int j = 0;
28.   for (int i=0; i < csv.length; i++) {
29.     String temp = csv[i][csv[i].length - 1];
30.     if (temp.equals("electro")) {
31.       shape(s1, count*21, j, 20, 20);
32.     }
33.     else if (temp.equals("rock")) {
34.       shape(s2, count*21, j, 20, 20);
35.     }
36.     if (temp.equals("alternativ")) {
37.       shape(s3, count*21, j, 20, 20);
38.     }
39.     else if (temp.equals("hip hop")) {
40.       shape(s4, count*21, j, 20, 20);
41.     }
42.     else if (temp.equals("soundtrack")) {
43.       fill(0, 190, 25);  
44.       shape(s5, count*21, j, 20, 20);
45.     }
46.     else if (temp.equals("live")) {
47.       shape(s6, count*21, j, 20, 20);
48.     }
49.     else if (temp.equals("jazz")) {
50.       shape(s7, count*21, j, 20, 20);
51.     }
52.     else if (temp.equals("pop")) { 
53.       shape(s8, count*21, j, 20, 20);
54.     }
55.     count ++;
56.     if (count % rowLength == 0) {
57.       count = 0;
58.       j += 30;
59.     }
60.   }
61. }