If you need a free template then I recommend you try some of these ones that 24Slides has: https://24slides.com/templates/featured. Source: almost 2 years ago

I was looking how can I increase my efficiency in the office, and usually have like 1-2 ppt to prep per week for different clients. I’m pretty ok at PPT but this is just draining too much… so I started using a FREE PPT TEMPLATES website and I basically cut in more than half my time on it. Is there a way I could improve this even further? What tools are you using to be more efficient at redundant tasks like this one? Source: almost 2 years ago

I've tried a few, the best one was pingo (https://css-ig.net/pingo). Pingo -s9 gives better results than oxipng with Zopfli, while being usually two order of magnitudes faster. It's also faster than "regular" oxipng while being better. I can usually shave of 15%/20% of the size of png files I encounter. One thing I didn't check is that you might pay that in decoding time, I've never seen anybody talking about that... - Source: Hacker News / about 2 years ago

Pinga, GUI for Pingo (https://css-ig.net/pingo) for lossless photo compression while keeping the metadata. Source: almost 3 years ago