When drawing the shapes via the standard ellispe(x,y,x1,y1); method, frame rate performance is pretty stable and more or less acceptable (occasional spikes down, but they're not significant). When implementing the PShape() method and drawing the shapes with shape(); performance takes a massive hit. I've benchmarked the phenomenon using a 5 minute benchmark in FRAPS. The graph is attached below.

Is this a known issue with PShape() or am I implementing it wrong? The code in its entirety is below. The PShape code is commented out and the standard code is working. 

2. public class Drums{    
3.     int[] array = new int[8];
4.     boolean running = false;
5.     
6.     PShape kick;
7.     float kickx = 60;
8.     float kicky = 60;
9.     
10.     PShape snare;
11.     float snarex = 60;
12.     float snarey = 60;
13.     
14.     PShape oHat;
15.     float oHatx = 60;
16.     float oHaty = 60;
17.     
18.     PShape cHat;
19.     float cHatx = 60;
20.     float cHaty = 60;
21.     
22.     PShape clap;
23.     float clapx = 60;
24.     float clapy = 60;
25.     
26.     PShape rim;
27.     float rimx = 60;
28.     float rimy = 60;
29.     
30.     PShape cow;
31.     float cowx = 60;
32.     float cowy = 60;
33.     
34.     PShape shake;
35.     float shakex = 60;
36.     float shakey = 60;
37.      
38.     float centerx = width/2;
39.     float centery = height/2;
40.     
41.     public void run(){
42.       if(running){
43.         display();
44.         shrink();
45.       }
46.     }
47. 
    
48.     public void display(){
49.         stroke(255);
50.         fill(255,255,255);
51.         
52.         /*
53.         kick = createShape(ELLIPSE, centerx, centery, kickx, kicky);
54.         snare = createShape(ELLIPSE, centerx-200, centery, snarex, snarey);
55.         oHat = createShape(ELLIPSE, centerx+200, centery, oHatx, oHaty);
56.         cHat = createShape(ELLIPSE, centerx+200, centery, cHatx, cHaty);
57.         clap = createShape(ELLIPSE, centerx, centery+200, clapx, clapy); 
58.         rim = createShape(ELLIPSE, centerx+200, centery-200, rimx, rimy);
59.         cow = createShape(ELLIPSE, centerx+200, centery+200, cowx, cowy);
60.         shake = createShape(ELLIPSE, centerx-200, centery-200, shakex, shakey);
61.         
62.         shape(kick);
63.         shape(snare);
64.         shape(oHat);
65.         shape(cHat);
66.         shape(clap);
67.         shape(rim);
68.         shape(cow);
69.         shape(shake);
70.         */
71.         ellipse(centerx, centery, kickx, kicky);
72.         ellipse(centerx-200, centery, snarex, snarey);
73.         ellipse(centerx+200, centery, oHatx, oHaty);
74.         ellipse(centerx+200, centery, cHatx, cHaty);
75.         ellipse(centerx, centery+200, clapx, clapy);
76.         ellipse(centerx+200, centery-200, rimx, rimy);
77.         ellipse(centerx+200, centery+200, cowx, cowy);
78.         ellipse(centerx-200, centery-200, shakex, shakey);
79.     }
80. 
    
81.     public void shrink(){    
82.       
83.       if (kickx <= height/2 && kicky <= height/2 && kickx > 0 && kicky > 0){
84.             kickx -= height/100;
85.             kicky -= height/100;
86.         } 
87.         
88.         if (snarex <= 100 && snarey <= 100 && snarex > 0 && snarey > 0){
89.             snarex -= 2;
90.             snarey -= 2;
91.         }
92.         
93.         if (cHatx <= 100 && cHaty <= 100 && cHatx > 0 && cHaty > 0){
94.             cHatx -= 2;
95.             cHaty -= 2;
96.         }
97.         
98.         if (oHatx <= 100 && oHaty <= 100 && oHatx > 0 && oHaty > 0){
99.             oHatx -= 2;
100.             oHaty -= 2;
101.         }
102.         
103.         if (clapx <= 100 && clapy <= 100 && clapx > 0 && clapy > 0){
104.             clapx -= 2;
105.             clapy -= 2;
106.         }
107.         
108.         if (rimx <= 100 && rimy <= 100 && rimx > 0 && rimy > 0){
109.             rimx -= 2;
110.             rimy -= 2;
111.         }
112.         
113.         if (cowx <= 100 && cowy <= 100 && cowx > 0 && cowy > 0){
114.             cowx -= 2;
115.             cowy -= 2;
116.         }
117.         
118.         if (shakex <= 100 && shakey <= 100 && shakex > 0 && shakey > 0){
119.             shakex -= 2;
120.             shakey -= 2;
121.         }
122.     }
123. 
     
124.     public void running(int[] _array){
125.        array = _array;
126.        running = true;
127.        
128.        if(array[0] == 1){
129.          kickx = height/2;
130.          kicky = height/2;
131.        }        
132.        if(array[1] == 1){
133.          snarex = 100;
134.          snarey = 100;
135.        }   
136.        if(array[2] == 1){
137.          cHatx = 100;
138.          cHaty = 100;
139.        }
140.        if(array[3] == 1){
141.          oHatx = 100;
142.          oHaty = 100;
143.        }
144.        if(array[4] == 1){
145.          clapx = 100;
146.          clapy = 100;
147.        }
148.        if(array[5] == 1){
149.          rimx = 100;
150.          rimy = 100;
151.        }
152.        if(array[6] == 1){
153.          cowx = 100;
154.          cowy = 100;
155.        }
156.        if(array[7] == 1){
157.          shakex = 100;
158.          shakey = 100;
159.        }
160.     }
161. 
     
162.