Low FPS issues in cocos2dx - cocos2d-x

Question

I have finished the following function, It is containing 26 if else block in update. So it reflects little drop in FPS.
I have checked the 26 object using dynamic casting. Depend on shape, i checked the logic.
Here is the coding.
void WagonNode::update(float dt)
{
int found = 0;
for (int32 i = 0; i < kMaxContactPoints100 && found < contactPointCount100_; i++)
{
ContactPoint100* point = contactPoints100_ + i;
b2Fixture *otherFix = point->otherFixture;
if( otherFix )
{
found++;
b2Body *otherBody = otherFix->GetBody();
BodyNode *otherNode = (BodyNode*) otherBody->GetUserData();
if (dynamic_cast<ShapeA*>(otherNode) != NULL)
{
tagWord(CCString::create("A"));
}
else if (dynamic_cast<ShapeB*>(otherNode) != NULL)
{
tagWord(CCString::create("B"));
}
else if (dynamic_cast<ShapeC*>(otherNode) != NULL)
{
tagWord(CCString::create("C"));
}
else if (dynamic_cast<ShapeD*>(otherNode) != NULL)
{
tagWord(CCString::create("D"));
}
else if (dynamic_cast<ShapeE*>(otherNode) != NULL)
{
tagWord(CCString::create("E"));
}
else if (dynamic_cast<ShapeF*>(otherNode) != NULL)
{
tagWord(CCString::create("F"));
}
else if (dynamic_cast<ShapeG*>(otherNode) != NULL)
{
tagWord(CCString::create("G"));
}
else if (dynamic_cast<ShapeH*>(otherNode) != NULL)
{
tagWord(CCString::create("H"));
}
else if (dynamic_cast<ShapeI*>(otherNode) != NULL)
{
tagWord(CCString::create("I"));
}
else if (dynamic_cast<ShapeJ*>(otherNode) != NULL)
{
tagWord(CCString::create("J"));
}
else if (dynamic_cast<ShapeK*>(otherNode) != NULL)
{
tagWord(CCString::create("K"));
}
else if (dynamic_cast<ShapeL*>(otherNode) != NULL)
{
tagWord(CCString::create("L"));
}
else if (dynamic_cast<ShapeM*>(otherNode) != NULL)
{
tagWord(CCString::create("M"));
}
etc...
}
}
}
If there is any changes in the above coding, it would help me a lot.
Can any one assist me to handle or stabilise the FPS?

Answer 1

Dynamic casting is slow and might be the problem here. In this case you could try using typeid to resolve the dynamic type:
example:
if (typeid (*othernode) == typeid (ShapeA))
{
tagWord(CCString::create("A"));
} elseif
...
Another thing is, you are creating potentially a lot of strings there, you might want to check if that causes the performance issues. Use a profiler to find out the actual bottleneck.