What does high deceleration time in echocardiogram indicate?

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It suggests grade 1 diastolic dysfunction. It is explainable by your obesity as evident from BMI - body mass index mentioned.

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E to A ratio (early to late ventricular filling) for grade I diastolic dysfunction, which is characterized by prolonged deceleration time due to prolonged relaxation, is typically less than 1.0. Also, your E/Ea of 6 suggests either normal diastolic function or grade I diastolic dysfunction. So, your readings have to be repeated by another echocardiography, although not as an emergency. For suspicion of cardiac amyloidosis (abnormal protein deposit in heart), there should be diastolic dysfunction of severe grade.

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In the first place, there is a discrepancy in the readings itself. Then, we have an explanation already (as high BMI) for this case and there is grade 1 diastolic dysfunction. To shed more light on the morphology of myocardium for diagnosis of amyloidosis, one may require cardiac MRI followed by a confirmatory endomyocardial biopsy.