TES gamma-ray microcalorimeter with a manually coupled bulk Pb absorber, which was fabricated on a 400 nm thick SiN substrate reported an FWHM energy resolution of 2.9 keV at 1173 keV and a signal response with a long decay tail of 135 ms. To reduce the device response time we have designed a new detector, in which the response time is improved by a factor of five.