Jenson Button insists there is still much to come from the McLaren-Honda, but insists simply getting more power from the Honda engine won't bring it to the front of the field.

McLaren scored its first double-finish of the 2015 season with Button and Fernando Alonso during the Chinese Grand Prix, but though there were flashes of form during free practice, it struggled to get amongst the mid-field in qualifying and the race.

Nonetheless, it is an achievement that Button says was a 'big deal' for Honda since the engine - which has suffered a series of reliability problems - is beginning to show durability even with increased power.

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"It was a big deal for Honda to finish with both cars," he said. "We are obviously pushing the engine a lot more than we were in Melbourne, so, very positive."

However, though Button is pleased with the chassis, he concedes it lacks downforce, adding that the engine's power deficiency isn't the sole reason McLaren isn't a front runner at this time.

"It is good, but we still need to improve in many different areas," he said. "I think we are still very low on downforce. The efficiency of the car and the driveability is very good but I still think we are lacking in quite a bit of downforce, but we know that and we have worked on characteristics of more than just throwing downforce at it.

"When you have that base it is very good because then you can start adding quite a bit of downforce, which we are hoping to do over the next few races.

"It is all going in the right direction but obviously if we had more power we would be more competitive, but we still wouldn't be competitive enough to be fighting at the front. So, there are areas we need to improve - well, every area of this car needs to be improved."