You're most likely hitting a CPU bottleneck. Dolphin needs strong single-core speeds to run, and the Q6700 is not strong enough for what Dolphin needs (I have a Q6600 in a Dell Inspiron 9200, and it has some lag in Dolphin).
Use one of the latest dev builds, as they are a bit faster than 4.0.2 stable. The games you listed ( Mario Kart DD and Mario Party 5) aren't really that CPU intensive, but you'll be hitting like 95% speed, which will cause the little freezes.
Make sure under Windows Power Options you have the power plan set to maximum performance.
https://forums.dolphin-emu.org/Thread-unofficial-laptop-performance-guide
Follow the GPU part to make sure you aren't being GPU bound also.
Use one of the latest dev builds, as they are a bit faster than 4.0.2 stable. The games you listed ( Mario Kart DD and Mario Party 5) aren't really that CPU intensive, but you'll be hitting like 95% speed, which will cause the little freezes.
Make sure under Windows Power Options you have the power plan set to maximum performance.
https://forums.dolphin-emu.org/Thread-unofficial-laptop-performance-guide
Follow the GPU part to make sure you aren't being GPU bound also.