Maximum texture size on Arm Mali 400MP

I see that Arm mali supports 4K textures & i have verified this using below calls

GLint maxGPUTextureSize;

glGetIntegerv(GL_MAX_TEXTURE_SIZE, &maxGPUTextureSize);

My question is : In my GL application ,I have an textures which are of size more than 4K & it does get uploaded without any warnings or errors from driver.

What could be the suspected performance impact here, I have an mip-mapping enabled in my code.

Could the performance impact be only be at startup Or it could also impact run-time performance too.

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